Need Registry Cleaner for Vista laptop

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. I found new registry cleaner (Digeus Registry Cleaner) from http://www.digeus.com
I like it, it does magic on Vista! My laptop works as new.

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.

 

Same post over on Wilders