Defragmenting
That would be the defragger.
ScanDisk Utility
fragmented
No, the Disk Defragmenter does not delete any files. The defragmenter rearranges the existing files on the hard drive so they are contiguous, rather than scattered around your hard drive in multiple pieces. The software that deletes temoporary files and what not is called Disk Cleanup.
Disk defrag rearranges files on your hard drive. Its supposed to help speed up the systems speed for accessing files but with hard drive speeds these days disk defrags dont increase performance by a noticable amount
No.
No. You need to have the flash drive unless you copied the files to the PC.
It rearranges all the parts of files on a computer so the they are all in one place. This increases the speed of a computer and is easier on the hard drive because it doesn't have to do as many seeks.
You can store setup files on a Hard Drive, Flash Drive, CD, DVD, or you can create a folder in c:\windows\temp
Most, yes. Moving operating system files or program files can cause problems.
Defragmenter good luck with your homework
Yes is possible to do a hard drive recovery from home. If you had your files backed up on an extrenal hardrive it would just be a manner of placing them back on your computer once you reinstall windows. If you did not have your files backed up, it may still be possible to recover the files if you get a usb connector for the hardrive and special hardrive recovery software which is available to download on the internet.