Severe problem, DIAMOND ATI 3650 HD

First, I need to get a few small things said:
- It probably isn't a power problem, as it runs "fine" BEFORE installing drivers
- Already disabled as many video drivers as possible, and some other drivers

Ok...my problem is that once I install the driver, after the reboot I get "many green lines of randomness" and it's impossible to read anything. I've tried both the driver off the ATI site and the included driver. Also, my computer doesn't really detect the card as I don't get an "install new hardware" thing, the card doesn't show up when I look anywhere and I can't use the driver anyways.

Other things are that, despite a "successful" (installer says so, I disagree) install, CCC doesn't work because the driver is non-functional. I guess it's because I'm using a Geforce 2 card (yep, no lies here) and the other time was in Safe Mode, but eh.

...soo, help please?

Pentium Dual Core 2.2ghz
1gb RAM
420 Watt Asus