Last couple of months I had BSODs that were driving me crazy. Just when I thought I had it under control updating MSE started the BSOD night mare again.
Power Tools Lite 2011 seems to have cleaned up a lot of the registry conflicts I was getting from unknown new hardware. Hitman Pro 3.5 is also an interesting companion to any anti-virus you use. There two programs were suggested by the good peeps here and I think they have quieted my cranky baby TOSH.