Be Right Back, Uninstalling

when i start it from steam I get "GTA IV FATAL ERROR: Windows Vista: Need to have service pack1 or higher to proceed."

I use windows 7 64bit

other people have had this problem and say it can be remedied by going into the files and launching as an administrator.

When it start and I can hit play but I get locked in GTA's loading screen where it's just music and pictures of characters.

any ideas?

verify file integrity via properties. Tends to help fix some bugs with file missing when downloading for some reason.
Its your best bet besides a full re-install or worse

Service pack for windows 7 finally downloaded and installed and after going into the files and setting compatibility to windows 7 (not an option with out the SP) it worked.