Re installing the Windows OS without formatting the disk will keep your files safe. Only the system files will be rewirtten no change will be to the data files. But files stored in My Documents and Desktop will be lost if you are going for a clean installation. Download Recover My Files software to recover your old files after a system crash.
If you don't mind losing all of your files then yes, it is ok.
\Windows
If you have encrypted this folder than the answer is no. To make it possible to open encrypted files after Windows reinstall you have to uncheck "Encrypt files" checkbox in the file properties dialog.
"Hidden" is a file attribute; this is information about the file that shouldn't change when you reinstall the operating system.
Yes, if you have copied all installion files on your hard disk. If you haven't you cannot reinstall Vista.
system mechanic probally is not starting because its files have crashed( which means you need to reinstall it) or there are other programs running that prevent it from starting.
You will have to go to a professional. He or she may be able to get the files from the hard drive of you crashed computer.
Reinstalling Windows will not erase the hard drive unless you tell it to reformat the hard drive before reinstalling the operating system. You will have to reinstall all your programs that were installed prior to reinstall but all your saved files will still be there.
If your restore requires a windows disk then you cannot restore without one. Most do not require a windows CD. Most include the windows files in the manufacturer restore.
I am unsure of the names but I can remember what each one does. The first one should merely reinstall windows but leave all your files where they currently are. The second one should move the current structure of your hard drive to a folder normally entitled something along the lines of "my old disk structure". It will then reinstall windows on your hard drive. The third option should completely wipe your hard drive and reinstall windows on it. If you have any files that aren't backed up then you will lose them. Dont use this option if you have any files on the computer when you use this option you will lose them!
Windows 2000 Professional, XP and Vista
Encrypting Files System (EFS)