Viruses aren't the only reason for system instability, and AVG isn't a cureall. Uninstall it and try one or more other programs. Start with online virus scans, via Google.
adam
Could also just be a corrupt file on the laptop
Try downloading something like Ad Aware www.lavasoftusa.com and see if you have any spyware on it.
If that doesnt work try a check disk
Go to run or start, all programs, accesories, command prompt
Type cmd and then press enter
Type chkdsk /r and then press enter
It will ask if you want to run this on the next restart. Press y and then enter
Restart laptop and let check disk run and it should repair any dodgy file that is there
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