I actually run 7 on my son's laptop, haven't gotten around to mine yet but with mods and whatnot I kinda have my V64 tweaked just how I like it, never had a prob.
There are a bunch of those codes out there too that do different things BTW:
Windows 7 has lots of 'GodModes' (exclusive) | Beyond Binary - CNET News
yeah once the SP's came out and all the sec. patches also Vista 64 is actually a good OS