The first is my computer freezes frequently. It won't matter what I'm doing, just every five minutes it will freeze and I'll be forced to press alt cntrl and delete. Once I bring up the task manager and close it everything resumes normal and it unfreezes. As you can imagine, this would get very annoying after awhile. I've run spyware scans and am pretty sure I'm not infected with anything.
The second problem is my comp, many times, won't start up. When it is about to load the log on screen, the screen remains blank, followed by my comp shutting down. However if I wait five minutes after it shut itself down, it will work when I try again (always). Sometimes there is an error message saying something about the lsass before it shuts down.