Northern,
I just got through with the nearly 8gig install this afternoon. I fired it up and all is good. I played the first few missions with no trouble. I'm running a trip. boot machine with xp,vista, and 7. All x32 versions. I installed RA3 to a different partition with no issues. The game fired up and updated without a hickup.
Let me know if you have any further questions. I'll be happy to try and help. It's a great game.
Karl
AMD Athlon 64X2 Dual Core 5000+
6gb RAM
2 GeForce 8600GT (SLI config) drivers- geforce Vista ver. 181.22
Sata drives 640gb and 250gb