Cards Fan..

I'm not sure if it would have made a difference, if you had included which operating system your friend is running. OR the name of the malware/virus. Although, it might have helped.

When researching the issue, did you read the sticky at the top of the AVG Forum titled, "Common Reasons Of PC BSOD"?

If there were BSOD issues specific to Dell and/using AVG 9 (after a malware/virus infection) I don't feel it was made obvious at this forum. With the exception of a handful of cases, I haven't read about it elsewhere, either. But I'm only one person. Perhaps, other's might be aware of the issue, with the combination you spoke of. What you might want to do is pose the question at our Dell Forum. Or possibly our AVG Forum.

You're welcome to read the threads I found at the AVG forum. In the scheme of things, I find them of little significance. Certainly not worthy of qualifying it as a "known issue".

AVG Related BSOD?
http://forums.avg.com/cz-en/avg-free-forum?sec=thread&act=show&id=51317

AVG 9 Is Crashing Computer - A 4 page thread with posts referencing (blaming) Dell, Windows 7 and AVG itself.
http://forums.avg.com/cz-en/avg-free-forum?sec=thread&act=show&id=28621

Crashed Dell, Finicky HP After AVG 9 Update
http://forums.avg.com/gb-en/avg-free-forum?sec=thread&act=show&id=73133#post_73133

Dell System Crash (BSOD)
http://forums.avg.com/sk-en/avg-free-forum?sec=thread&act=show&id=3753

Best of luck..
Carol