If your computer is running slow there can be many reasons that cause
the problem such as a virus or spyware but one of the main reasons is a
corrupted registry in windows. Anytime you install then uninstall
software it can leave remnants in your windows registry and the more
you install and remove, the more remnants. Eventually, your computer
may become slower and slower.
You can purchase and download a repair but before I would do anything
I would visit a site that offers a free windows registry scan to make
sure that the registry is the problem. This should be your third step
after running a virus scanner and running a spyware detector, both you
can get free. Many of these will give your computer a free diagnostic
scan and let you know where the problem is, saving you both time and
money.
If the free diagnostic computer scan shows that the problem is your
windows registry then you will need to get a repair utility of some
kind to perform a recovery. What you need to look for in a registry
repair tool is one that has these benefits and features:...

Registry Repair: http://groups.yahoo.com/group/regrepairsbv