Make sure you get the specific dxwebupdate from microsoft.
Update your drivers! current ATi driver version is 10.8
This one is a long shot, but if you still have the garbage creative software installed, make sure bass boost is NOT checked [I've only ever heard of this crashing steam, but it doesn't hurt to be cautious]
I never had a problem with the benchmark on my G73, but I removed *all* the garbage they had on the machine. People have complained previously about issues with Power4 gear, creative, etc.
Also, when you *DO* get it up and running, make sure you download hwmonitor from cpuid and have it running in the background to check your Gfx card temps. There is a known issue with some of these notebooks where the Thermal paste is not well applied and/or the heat sink is not properly installed. Making sure you're at a safe level couldn't hurt. The 5870m starts downclocking at 105c, and I BELIEVE it's supposed to shutdown at 110-115c. mine maxed out @ 98c on the benchmark, a little higher than others have reported, but not quite in the panic zone.
Edited, Sep 1st 2010 3:38pm by seneleron