Ok, I installed Vista inspirat 2 on a Windows x64 edition and now the pc doesn't work. After the instalation the system rebot and then it won't work. It only shows empty desktop, there are no icons and anything I tried doesn't work. I know it's my fault for now checking if it works on x64 edition. Any ideas how do I fix it? Is there a way without reinstalling the whole system?

Hello, lexyy.
To begin, I am French and therefore I am not sure that the translation obtained from your post is fully trusted. It is also possible that the translation of my answer (made with live search translator) is bad.
So, if I have understood correctly, you want to uninstall Vista Insparat 2: Verify all firstly there is no icon on your desktop called Vista Insparat 2 config. If this is the case, use this icon to open the BricoPack's Control Panel and then click Remove BricoPack. If there is not, try removing it via the "Add/Remove Programs" window.
This is what I can tell you because I don't know Windows XP x64 Edition.
 
AstroFacile

I do want to uninstall it but nothing works. When I start the computer it's just an empty desktop, there are no icons at all. I tried ctrl-alt-del and some other stuff but it doesn't react to anything.

Have you tried to boot into safe mode (press F8 during boot).
If that doesn't work either, you need to do a repair install of Windows XP.
 
If you need help with the above two things, use google (how to repair install xp OR safe mode xp)