How to solve this interesting computer software problem?

[mtptl77]

I got a virus that corrupted my Windows system files (Vista). I decided not to format the drive, since the virus was deleted. I inserted the CD and installed Windows.
Everything would be good, but all my programs, pictures, music are now in a folder named "Windows.old". My current system is blank.
My question is this: Can I copy my user table, my program files, etc. to replace those blank onces I have? Or is it necessary to install EVERYTHING again from the CDs?
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Accommodation Italy | Milan

[guestolo]

Don't delete the Windows.old folder till you have moved what you want to save from it to your present installation

So if there are some pictures for example in the "windows.old" folder you want to keep
copy and paste them to your new profile folder
When your all done saving whatever you need, you can then remove the "windows.old" folder
by simply doing a Disk Cleanup

Go to Start > All Programs > Accessories > System Tools >  Disk Cleanup.
Click on "Files from all users on this computer".
Select the Drive where your Windows.old is>typically C: drive

In Disk Cleanup dialog, select Previous Windows installation(s) in the "Files to delete" list. Click on OK.