Indy and Eric have some excellent points.
I would love to know what's in your system's event logs.
As I have pointed out elsewhere, there is no excuse for having those kinds of problems at such a high frequency - regardless of operating system.
I PM'd you my number. If you wish to discuss what's going on, I'd be happy to offer what advice I can.
With myself, Indy, Eric, Bert, and others here, you could also try to describe the issues you are having in posts and maybe some of us can point you in the right (or at least better) direction.
JamesNT