I recently had an issue with my Windoze gaming PC. It worked OK except when I played videos (youtube,etc) then it would randomly freeze.
Now, I've been an IT tech since 1973. Mainframes to PC's, I know WTF I'm talking about.
I did everything under the sun. Drivers, card swaps, registry cleaning, better cooling, you name it. Everything would have pointed to a hardware issue, except that even when gaming (which uses more HP than just about anything) the computer worked fine. It was only with video that I would get completely random lockups.
I finally threw in the towel last week and did a complete reinstall, which was a biatch because the computer had tons of software on it. You can back up data, but you can't backup and restore apps (bare metal) and expect a clean install.
Everything is fine now. Windows Blows. And don't even get me started on spyware, virus, rootkit, and malware BS.