Windows 7: Need help with upgrading my graphics for Windows 7

I have an old Gateway 506GR Desktop that meets all the minimum requirements except for the graphics. My OS is XP 32 bit at the moment. Right now the built in graphics is only 32MB. I have an add on graphics slot open. If it makes any difference the cpu is an Intel Pentium 4 3.4 Ghz. The expansion slot has a PCI Express x 16 connector. My power supply is 300 Watts. The only thing I do is a little photo editing ( Paint Shop Pro). I would like to stay under $50.00 if possible. Any advice would be much appreciated.

Any one of these should fit the bill.
Newegg.com - Computer Hardware, Video Cards & Video Devices, Desktop Graphics Cards, $25 - $50

Thanks for your reply. I had looked at these, but became confused when I noticed they were 64 bit. My system is 32 bit, Is that a problem?

In a nutshell, yes. It will work.

Graphics card do not come 64bit and 32bit

They show 64 bit in the description. I guess that just confused me.Thanks again.

The bit referring to GPUs means the internal interface of the card. It will work on any modern system. The expensive cards come in up to 512 bit, relating to how the GPU addresses the onboard RAM contained in the card itself.