BSOD on freshly installed v3

Ok I had v2 on here & could not get a full scan to complete it would start scanning & scan window would disappear & it would say cleaning in log so I uninstalled v2 clean all files & folders from v2 & downloaded v3 to see if I would have better luck with that & got it set up & started a full scan & would of been all most finished & got a BSOD "IRQL_NOT_LESS_OR_EQUAL" & its saying the scanning in progress in the log now.

I would like to know what would cause this from doing a scan as thats the first BSOD I have seen happen in a long time.