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Why would your computer freeze up after defragmenting the hard drive?

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Moved Files One reason may be because files were moved and your computer needs to be restarted cause the computer was reading the files and they all of a sudden moved.

 Physical Faults One possible reason for this is that your hard disk is developing physical faults. Sometimes these faults may not be picked up by tools like ChkDsk however chkdsk is a good place to start I would advise using the /r option. There are other free tools around that can help you identify Hard disk Faults like "Drive Fitness Test". If any of these tests show that the hard disk does have faults it should be replaced as soon as possible. Software is available that will enable you to clone the faulty drive onto a new one.
put your computer in SAFE MODE.THEN DEFRAG.  
Check your hardware in device manager and see if there are any conflicts,(yellow ? marks), beside your display adapter, your monitor, and your sound drivers), sometimes a driver can become corrupt and you may need to update it. Also The defrag could have defraged a file in your registry that is no longer used, I recommend buying Registry Mechanic, this will fix any errors in your registry that can also cause freezing. One last thing, go into safe mode, and do a scan on your hard drive for errors, make sure before you do the scan make sure the box is checked for,"automaticaly fix errors". Then when that's all done, do a defrag in safe mode.
Like you I have had problems defragging, but I think that in my case it was something wrong with the defragger, as when i did it 2 weeks ago, then my computer crashed doing this, i restarted, 'Cannot Find Hard Drive', so then it went to a comp shop they fixed it, did disk defrag again, then computer restarted with the same problem, then it started to go through, 'Used Clusters' 'Unused Clusters' 'Bad Clusters' then here it takes forever to do then the computer frooze, so i turned it off, went and bought a new computer
Your problem is either a driver, harware or heat issue. Try updating chipset drivers with the original that came with your motherboard if it doesint work update with windows update to get the a signed driver, check to see if your hdd is running hot if you cant touch it get rid of it, update your bios if this occurs when you have just changed your hdd, disable the s.m.a.r.t function in bios if your hdd is older than 9 years old and lastly has i have seen enough before your video card is failing, change it.

Please perform the steps given below to increase you system performance.
1. Uninstall all the unwanted software.
To uninstall a software :
a. Click on Start -> Settings -> Control Panel -> Add/Remove Programs
b. Select the software from the list and click on Add/Remove button and follow the online screen instrctions.
2 Erase unnecessary files in the windows temporary folder.
1. Double Click My Computer.
2. Double Click the drive where windows is installed. This is typically drive C.
3. Double Click the windows folder. This is typically C:\Windows.
4. Double Click the temp folder.This is typically C:\Windows\temp.
5. Press control-A to select all files and folders.
6. Press the delete key.
7. If confirmation is asked to delete these files choose yes to all.
3. Defragment hard disk.
1. Close all applications.
2. Disable your screen saver.
3. Disable all the programs on the taskbar if possible.
4. Click Start.
5. Click Program.
6. Click Accessories.
7. Click System Tools.
8. Click Defrag.
9. Select the drive to defrag. You should defrag every hard disk on your system. This process can take a long time.
10. Click Ok.
11. Enable your screen saver.
4. Remove Startup programs
Click Start
Select Run
Type msconfig in the text box
The "System Configuration Utility" window will open
A list of programs will be shown each having a checkbox to the left of the name.
Click on the checkbox to enable the program (so it runs when windows boots) and click a second time to Uncheck the box to disable the program (so it does not run when windows boots).
5. Set the size of the virtual memory (swap file) to an constant optimal size.
1. Right click My Computer
2. Click Properties
3. The System Properties window lists the amount of RAM in your PC (record this for step#8)
4. Click Performance
5. Click Virtual Memory
6. Click Let me specify my own virtual memory settings
7. Click the arrow next to the hard disk.
8. Here are some guidelines to choose the best location for your virtual memory file
a) Select the quickest hard disk.
b) If you have, two hard disks that are similar in performance select the hard disk that does not contain Windows system files.
c) Make sure the drive has free space equal to at least twice the size of the recommended swap file size.
d) If the partition is on the same physical drive, select the partition in alphabetical order. For example, if you have one 2GB hard disk and you partition it into two 1GB partitions drive C & D) You should pick Drive C over Drive D if meets all the guidelines of a, b & c.
9. Set the Minimum/Maximum to: With large hard disks settings a 128mb or 256mb swap file should be sufficient in almost every situation.
Note: The amount of RAM plus the size of the virtual memory file is the maximum amount of RAM you can use at once. Win386.swp is the filename used for the swap file. The file is quite large don�t delete it.
10. Click OK.
11. After setting the size of the virtual memory file windows will display the following message. You have chosen not to let windows manage virtual memory automatically. Click Yes.
11. You must restart your computer before the new settings will take effect. Do you want to restart your computer now? Click Yes
12. Sometimes Windows 95 takes a long time to shut down. During this time, it is doing necessary system maintenance. You must wait while the computer shuts down.
Also try using a registry cleaner, some file paths may be redundant, a registry cleaner will fix these errors. Visit http://registryfixer.weebly.com for top rated cleaners
13. Actually this problem bothered me quite a long time too, but recently I find functional software which can fix all these problems just with one click: tuneup360, maybe you guys could have a try.
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Thanks for the feedback!

How do you defrag a hard drive?

In Windows, go to Computer or My Computer and right-click on the  drive that you wish to defrag. On the context menu, select  Properties. Then tab over to Tools and select d

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It would depend on how badly your drive gets fragmented. If it does so on a daily basis, you could simply install a tool that will analyze and run in the background without ma

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While the default file system used on a Macintosh doesn't require defragmenting, you can do so with a thrid party utility called iDefrag. However, some argue that defragmentin

How do you defragment the hard drive?

To being the process click Start then Run then type "dfrg.msc" (without the quotes). You can also get to the defragment program by going to Start > All Programs > Accessories

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It depends on two things. How big your drive is, and how fragmented it is. So any where from a few minutes to, I've experienced, over and hour.     Also defrag is fa

How long does it take defrag a hard drive?

This is entirely dependent on the size of the hard drive an its contents. One might say a fairly clean hard drive should defrag in less than 30 minutes. If your hard drive is

How often should you defragment your hard drive?

I usually recommend around 2 - 3 weeks. People may say different but its a personal choice. If you install/uninstall applications alot, once a week would be recommended.

Why would you defragment your hard drive?

Very very simple: Click the start button, then click on Control Panel, then click on Performance and Maintenance, finally click on Rearrange Items on Your Hard Disk to Make

Why should you periodically defragment the hard drive?

Over time the files on your computer can become very scattered. Files are found on hard drives by moving a tiny arm called a head across the surface of the disk. If the files

What are the benefits of defragmenting your hard drive?

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What is defragmenting a hard drive?

Most modern operating systems use a file directory system to keep  track of the physical locations of files. When you delete a file,  its physical address is considered by t