Not much is going to run on those specs. I'm surprised it can run Windows and PS to be honest. I'm not an expert but there are going to be few, if any, that can run reliably with that little RAM and CPU.
There's Tattoo by TeraBit: http://www.terabit-software.co.uk/Tattoo.aspx It uses Direct3D 7, and I suspect that it doesn't support graphics tablets. You can still use a tablet with the program, but it'll be treated as a mouse cursor. It should run on any Windows system if the compatibility setting is on.