I have never had a problem with it on either of my XP and win7 systems, and of the many that have used it for real in the viruses and worms forum, I can't recall any BSODs.
However, you don't give any information about at what point it gave the BSOD, nor do you say what scan was applied on the AV scan: Quick, C:\ [...] or None ?
You also don't say what version of aswMBR you were using ?