Careful
If you do a Restore you will erase all of her documents data and programs.
Do you know what you are doing?
Does the computer have a restore partition on the hard drive?
Free Anti-Virus for home use
AVG Free
http://www.versiontracker.com/dyn/moreinfo/win/20601
Avast! 4 Home
http://www.avast.com/eng/download-avast-home.html
Mcafee Free tools
http://us.mcafee.com/root/catalog.asp?catid=free
Clam (open source)
Mac http://www.clamxav.com/
Win http://www.clamwin.com/
Unix http://www.clamav.net/
Anti-Spyware
Ad-Aware 2008
http://lavasoft.com/products/ad_aware_free.php
SpyBot Search & Destroy
http://www.safer-networking.org/en/
CCleaner (cleans out caches) http://www.ccleaner.com
Consider using Firefox instead of Internet Explorer
http://www.getfirefox.com
If you already have a virus, try running the cleaner programs in Safe Mode (hit the F8 function key as the machine boots up, and choose Safe mode)