Having trouble switching from my Nvidia to ATI...Help :(

So I'm playing this new mmohttp://en.wikipedia.org/wiki/Massively_multiplayer_online_game Warhammer Online and think my graphics cardgraphics card may be causing the choppy play I get here and there, mostly when a lot of players are on screen. So I wanted to switch out my 7950gtoc for my new ATI 8540.

Now in order to do this I had to buy a new power supply, 500W and install that as well. I tried to get rid of all things Nvidianvidia and then hooked the new card and power supply in. However when I started the system it would boot uphttp://en.wikipedia.org/wiki/Booting and give me two errors and then shut down and the repeat.

These are the errors it gave me:

Error loading C:\Windows\system32http://en.wikipedia.org/wiki/Architecture_of_Windows_NT \NvCpl.dll
The specified module could not be found

and

Error loading C:\Windows\system32\NvMcTray.dll
The specified module could not be found

Not sure what to do since I thought I had gottern rid of the old drivers. I tried driver sweeper but not really sure how to use it and probably did it wrong. I guess the *Nv* means Nvidia is still around yes? Maybe I should just get a 8800 gt from Nvidia and that will be easier.

Any suggestions would be most welcomed!

you dont happen to have a gigabyte motherboard if you do you need to update the bios

Those files are NVidia Driver files. It sounds to me like you didn't uninstall them properly. Boot your computer up in safe mode and uninstall them there. Also check the device manager to see if your 7600 is listed. If it is remove it. After you have done that reinstall the ATI drivers and you should be good to go.