Windows XP Problems

Today I was not feeling to work as my Windows machine is crashing all the time. In the last 20 hours it has shown me a blue screen for almost 10 times. I’m thinking that there may be some problem with the registry or some virus had attacked my machine. I even scanned it with a good antivirus software but it didn’t find anything. So I was planning to install Windows Vista and give it a try. But I was very happy with Windows XP.