iTunes Registry Problem

Help, I have a HP Pavilion dv6. It has Windows Vista Home Premium. When I opened iTunes it came up with Warning Registry problem something like that.
I want it to go back to normal, please help me !

I have tried Gear software, it was reccommened and it still didn't work and I have reinstalled itunes and still nothing, but when I play a cd it works and stuff but the warning thing pops up !