Ok, for a video card I installed an nvidia geforce 8400gs which has 512mb of ddr2 memory. It was definitely at the lower end of the price range at 90 bucks but blowing big money on this computer would be like these slopes customizing these piece of shit nissans, hondas and small pickups to race them- not worth the money.

I had a 1GB chip so I replaced one 512mb chip with that and I'll get another 1gb chip to replace the other 512mb chip whenever I see it on sale.

We re-installed Guitar Hero and it plays fine now. Not quite as smooth as the console version I'm told, but much much cheaper.