If you want your computer to perform at top performance, the basic 
thing that you will need to ensure is to fix registry problems and clean your hard disk from unneeded file regularly since faulty software installation or removal always cause that mess. For this purpose, Ccleaner can do the task easily for you.
CCleaner (CrapCleaner) is a simple software that removes unused and temporary files from Windows machine, and has performed very good after nearly two years I’ve been using it. It has an advanced registry scanner that removes old and unused entries, file extensions, ActiveX Controls, shared dlls, invalid shortcuts, application paths, etc. Unlike other system-optimization-programs, it’s free of charge. Here’s the publisher’s description about this software:
CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. But the best part is that it’s fast (normally taking less than a second to run) and contains NO Spyware or Adware!
March 25th, 2007 at 4:43 am
I also use this thing…fast clean up..
March 26th, 2007 at 7:01 pm
Yup. It’s good stuff. I’m also surprised that the author always updated this free software
April 5th, 2007 at 7:34 am
aman: yeah, I know that you have also mentioned it in your blog last time.
suhaimi: Is it? Thanks for the info.