I leave my computer on all the time. About 2 weeks ago, there was a very brief power outage that booted my computer. Unplugged it, reconnected and started computer. Did a restart because it wasn't working properly, and that took about an hour to complete. Now it takes me 2-3 minutes to open wsj.com (for example), or the system just freezes completely. If I wait 5-10 minutes, the problem fixes itself, but I am still prone to freezeups (handups?). Any suggestions for diagnosing the cause and fixing it?