Trouble installing XFX geForce 5200 PCI drivers

Short version:
Any driver I try to install for this- the companies or unnoficial ones- gives me an error.

Very long version:
I order the retail version of said package fo $80 for my Dell Dimension 2400 (POS, I know) that runs WinXP home, and try to install it. It turns out I don't have the power supply for it, so I go buy a 300w PSU for $50. So now, it detects the card- add hardware wizard comes up at startup after I uninstall the integrated graphics driver- but when I select the driver to install for it, it says "no hardware information present" or something similiar (I would give exact error, but I would have to disable integrated video, reboot, go through add hardware wizard, reinstall old drivers, and reboot again). This happened with the driver included on the CD, the latest driver from the company, Omega drivers, and Starfall drivers. All the same thing. If I plug the moniter into the card anyway, it's idle (like what happens when the moniter is turned on and plugged into a shut down computer).

Please... I beg of you people... don't let this $130 I couldn't really afford to spend in the first place go to waste!

 

reboot in vga mode and install the drivers from the setup disk

 

Sorry, but what's VGA mode?

 

in appearance it looks like safe mode.
when you boot up press f8,this will bring you into the boot options menu
where you can choose vga mode
booting in this mode stops windows from reinstalling the drivers you want to get rid of