Looking for a safe registry cleaner for win me. Many advertised, but i am leary. Any suggestions?

I am using Windows XP x64 edition and want to find a good registry cleaner for x64. Any suggestions?

My laptop has 446 MB RAM. Random, I know. How can I get my computer to speed up while playing the game? It runs okay, but there is occasional lag that is only there because my computer isn’t running well.
ATI MOBILITY RADEON 9000/9100 IGP

I have a Windows XP Professional With 74GB Hard drive. I need to know how to clean my computer more effictively. Can you tell me how? Thanks!!!
please tell me what to do with my computer to make it faster too i will accept all answers cause this is slow.

This would be the whole text:

Warning – visiting this web site may harm your computer!
Suggestions:
Return to the previous page and pick another result.
Try another search to find what you’re looking for.
Or you can continue to http://www.google.com/ at your own risk. For detailed information about the problems we found, visit Google’s Safe Browsing diagnostic page for this site.

For more information about how to protect yourself from harmful software online, you can visit StopBadware.org.

If you are the owner of this web site, you can request a review of your site using Google’s Webmaster Tools. More information about the review process is available in Google’s Webmaster Help Center.

-end of the text-

under that, written is :advisory provided by Google

I know that this one would be a virus because…it blocks even google itself…i just dont know how would i remove the virus…so please help