Internet Explorer Causes BSOD

I was wondering if anyone could shed some light on an issue several of my users are facing. When they are attempting to access or are browsing the internet (using IE 5.5 or 6.0 sp1) they intermittently receive a blue screen (Stop: 0x0000007f, Unexpected_Kernel_Mode_Trap). I’ve run the repair on IE updated/re-install O.S. and IE service packs and patches and searched MS KB and this site. Any ideas would be great.