Bzzzzzt!! Jv16 Powertools (macecraft.com) is a great program that cleans up your registry. The registry being clogged from unremoved links to old programs will really slow down the start up of your computer. This program takes care of all those disconnects.
My computer has had a lot of software installed and uninstalled over the years and had really slowed down. While I do know my way around a computer, I'm not a computer expert by any means. But I tried Jv16 Powertools (macecraft.com) and it got rid of the junk without creating problems of its own. My PC now boots in less than half the time and no longer hangs up. Highly recommneded as far as I'm concerned.