Context Menu being created if you install 7-Zip or TortoiseSVN in Windows 7 while it works just fine in Windows XP

Context Menu being created if you install 7-Zip or TortoiseSVN in Windows 7 while it works just fine in Windows XP

I've installed 7-Zip in XP and it creates a context-menu in Windows Explorer. But, in Windows 7 it doesn't. I don't know why. I tried it with administrator privileges, but nothing happened.