Which device driver is causing blue screen? 2

Much in the same vein as LINK WOZ 'ERE I'm getting BSODs every now and then too. I've run a test with MemTest that didn't find any problems so I've attached my last five MiniDumps; hope you guys can help me. Some information on how I can find out what's wrong for myself next time it happens would be great too. I'm running XP, all updates (apart from latest .NET service packs which I intend to install later when I have more HDD space) BTW.

Many thanks,
John.

PS: I've had to remove the link in this post due to the forum's rules I don't understand.

All the crashes are caused by SpeedBit. See if you can update it.

Debug Memory Dumps (http://forums.majorgeeks.com/showthread.php?t=35246).

BugCheck 1000007F, {8, 80042000, 0, 0}
Probably caused by : sbbotdi.sys ( sbbotdi+6550 )
Image name: sbbotdi.sys Timestamp: Thu May 31 02:46:11 2007 (465DB863)

Many thanks. Their Video Accelerator never seemed to work on this computer for some reason but Download Accelerator is already updated to the latest version. I've un-installed VA so hopefully that should fix things. DAP crashes now and then (not with a BSOD) but I find it invaluable so I'll think about keeping it or not.

BTW, how would I go about finding out this information for myself?
Thanks again.