Sounds like she got some S-P-Y-W-A-R-E or/and Viri lingering around
If she has XP this is what I usually start with for effectively removing all spyware and viri.
Boot into safe mode (after BIOS runs POST hit F8 rapidly to get to the boot menu options screen which you will safe mode) Logon as administrator.
Go to START>RUN>MSCONFIG>STARTUP then disable ALL items under there except virus scan.
Go to START>CONTROL PANEL>FOLDER OPTIONS>VIEW and select show hidden files and folders. Then go to c:\documents and settings and go into each user folder and delete ALL of the following files c:\documents and settings\%user%\local settings\temp and C:\Documents and Settings\%user%\Local Settings\Temporary Internet Files and finally c:\documents and settings\%user%\cookies.
Delete all files under C:\WINDOWS\Temp and C:\WINDOWS\Prefetch. Empty the recycle bin and reboot the PC.
Download Spybot S&D 1.4, Adaware SE 1.6, and java cool Spyware blaster. Run all updates for all software then run the scans with adaware and spybot (spyware blaster is not a scanner but helps prevent spyware by blocking active x controls from bad websites). Ohh also before you run the scan with AdAware be sure you download there latest VX2 plugin found here: http://www.lavasoftusa.com/software/...2cleaner.shtml
Fix all spyware then update your virus scan and run a full system scan for viri. After all this I usually re-isntall IE6 to rid any mess left over. whoa that was a lot of writing..Im saving this for future use..lol.
that should get you on your way.