Hey there! I'm having a hard time trying to run my GC client on Windows 7... I lurked the GC forum and I found a solution that I can't use

which is just to install it on a XP/Vista comp and transfert the whole files after patched. But sadly I got no other computer from which I could install GC on.
Is there any other solution?
I might also change back to XP (I'll never EVER switch to vista again) since I'm tired of all the compatibity problems

I can't even run PSU nor Atlantica :/