thanks for the reply, there has been no bsod for 2 weeks now since i unistalled avast, used clean tool etc and did a fresh install of latest version, in the general forum there has been quite a few threads on bsod with various build of xp and avast ask people to upload there mini dump file when this happens i didn’t i tried different memory reinstalled motherboard drivers etc and diplay driver and repaired windows install , what concerns me is that mbrcheck.exe, rootrepel, and the trend rootscan tool wont run in normal mode, also 2nd hd has no o.s. installed it is a external drive ,i also enclose 2 logs of processor explorer the first one will let mbrcheck run in normal with redused processor’s limited by msconfig by removing startup items intresting you cant stop avast the second 2 is all drivers loaded this then freezes when mbrcheck is run thanks baz