I'm still playing Vindictus... The only problem I have with it is the content can be completed pretty quickly and then it takes a while for them to release new episodes. The only lag I've ever encountered has been laggy host. Never anything graphics related.
You seem to have what some G73 owners refer to as the PSOD... The psychedelic screen of death. The only remedy is to RMA the laptop for a screen replacement.
Another person here that can vouch for the awesomeness of the G73... I picked up one of the Best Buy models and have been loving it so far :D:D:D
Just to chime in on the GSOD issue.. I'm running newer drivers and have not had a single issue. This is with hours of GTA IV, BFBC2, GRID, NBA...
Wow I may run out and get this version if those are the only differences and the screen can possibly be upgraded later... Kinda tired of waiting for this puppy to get back in stock.