Youve Not given much info on your MB or your PS .I recomend at least a quality Power Supply of 350 watt .
So heres a recomendation
Consider this just to get you by .Your processor is fine for now.
When you do get your new system , this 1 is a good backup system.
Upgrade your video card so that you can still use it in your next sytem.ATI 9600 or better , Nvidia Ti 4600 or better .Add a stick of memory or configure it up to 256 mb for win9x . 500mb and higher for Xp OS .
Before you upgrade it Download and install 3Dmark01se .
Run some benchmarks at various settings and save the results as a txt file. Then upgrade your system and run the same tests compare them and see your performance gain