pc shutdowns

Anyone out there had any problems with system crashing
after either a windows update or a mcafee update or a
combination of both. do you know of a recent update that
does not mix well with mcafee?? Help , my system keeps
shutting down and rebooting. If I uninstall my mcafee, it
seems to be ok, but I need the virus protection and paid
for it thru next december.. Any thoughts? Thank you...