My computer freezes on start up as soon as I click something? PLEASE HELP! I will give best answer?

This is caused by a Processor Problem, i'm uming that you have a low end one. I had the same problem with my Compaq Persairo With Windows XP, which Came With an AMD Sempron 3400+. I had a lot of Programs, and Important files & doents that I needed for school. What seems is that Avast! or any Anti-Virus will say your computer is at risk, or something related to not updating it frequently. Your Best Option is to go into Safe Mode By Pressing F8 Several Times until the menu comes up. (Choose Safe Mode with Networking in case you need to use the internet to update things. This is a Mode that only loads the Core drives essential for the computer to use. In the mean time you can Run Disk Clean Up, Defrag And getting rid of some programs by uninstalling it in the Control Panel. Try to get rid of unwanted and programs that you don't use. If this Problem is still happening it's a Processor problem (CPU) and you will need to get it replaced/ or upgraded at a Computer Store.