I do not own Win7 -64bit. However, I have heard that everything should work with Win7. The only exception might be the H3.6.3 version. I say 'might' because some guys say that they run it, but I don't know if it is with -32 or -64 bit system. Also, the HCE Scenario Editor will not run with -64 bit systems.
Other than suggesting that you install with Administrator-level authority, nothing much comes to mind.
Can you elaborate on what problems or messages you are seeing?
I keep getting various errors, and two--can't remember which Harpoon3UltimateANW-- refuse to start.
I am going to reinstall it again, going slowly, and see if i can get it right.
There's also supposed to be a required patch 3.10x which I can't seem to find.
Also, there is the problem of it asking me for a key.
Well I paid for it and have my serial.