I have a Dell Vostro 230 with Windows 7 Professional. I recently had to reinstall Windows 7 after my children installed some kind of computer demon on it and I couldn't get anything to work. After reinstalling the OS, I had a problem downloading updates. I fixed that problem, and now I am having a problem with unexpected shutdowns. I get the blue screen, the computer restarts itself, and I get a message saying there was an unexpected shutdown and I'll be notified when there is a solution. On occassion, I'm also having problems shutting down and starting up my computer: it freezes in the middle of the process. Additionally, when the computer goes into the screen saver mode, after I haven't used it for 10 minutes or so, it freezes on a page that just has the background picture. The task bar isn't visible and the only option I have is to shut it down with the power button.
I would really appreciate some direction on how to fix these problems.
Thanks in advance,