You use V2 or V1?
V2 seem to freeze/ block in some cases to me, per example if you click too fast on a waypoint, clicking too fast on login, moving the midnight window too fast ... So now I simply use it smoothly without being nervous and everything works fine, and I have w7 pro 64 bit also.
If you use V2, be also carefull to install the file "vcredist_x86" that you'll find in the v2 .rar, otherwise it doesn't work.
If you use V1, I have no fuckin idea so I'll let someone else to give you some advices.