I had a bunch of driver problem with my R2Hv. Wireless would be flakey, the system would not always shut down, sleep mode was a joke and I had a bunch of boot problems. The solution was to re-install Vista using the ASUS recovery tool. There is a hidden partition on the device that you can get too when you boot the device, and from there you have the option to re-install to Partition C, D or both. Since I saved all my data on D, I just did C, and BLAM all my problems went away. Apparently the restore partition has newer drivers than what came installed on the device. Weird, but I'll take it.
When I called ASUS support it was the first thing they recommended to do. I wish I had listened to them, as it wound up being the LAST thing I tried. I was fearful that it might brick the device, resulting in my having to mail it to ASUS for repair. But now I know better :) Heck I think I'll just do that from now on with every new computer I get!