How to Clean Registry on Vista?

Hi all,

I bought new laptop - HP PavilionDV7. It is nice and very fast.

After I removed some games I noticed that my pc started working very slowly.

I tried to fix my computer with my old registry cleaner that I used on XP, but when I finished I had to reinstall everything!!

Few weeks later all these repeated again.

removed link to possible spam - moderator

But there is another problem - I've noticed that the total size of files on hard drive before installing games and after uninstalling them is different.

It became approximately 2GB more.

How can I delete all these files that I don't need any more?

Thanks.

CCleaner has a built-in registry cleaner...