There is a machine on my LAN where they are using Skype and previously used Pidgin, Spark and now using Jitsi.
If Jitsi initiates a voice/video chat or receives a voice/video chat request, the computer immediately goes into BSOD.
This never happens to Skype.
The config is Win7 64bit, Microsoft LiveCam, Asus AM2 mobo with Phenom II and 4x2GB RAM.
This machine is the only one where this issue exists. I have a few more AMD 64bit machines and none has the same problem. Neither to Intel boxes.
Native Microsoft LiveCam app can grab video no problem, same about audio via various sound app.