Originally Posted by JogaBonito1502
If this is all you can afford right now then I'd say hold out a bit more. With such an extensive upgrade it would be better to just finish it off with a new build. Instead of getting the 9600GT I would get an 8800GT. It's a better bang for the buck IMO. I would also switch from OEM to Retail Vista so it doesn't give you any troubles with reformat and such. Like I stated earlier, I would wait so you can get a new build, however, if you want to make these new upgrades you will have to improve the cooling on your system and make sure the PSU can handle everything that you want to put in it.
for just some light gaming I would just get a cheap 8600GT or something similar, he'll need most of the money to go to other parts because if I was him, I'd scrap everything I had in that system except for the hdd, he could use it for his system/boot drive and add another for storage (music, video, pix, etc.), if he doesn't want to/know how to build, the system I linked below would be a decent enough system for what he wants to do and it has onboard HD audio, also the price leaves him some room in his budget to add memory (it only comes with 1GB and runs Vista so he'll definitely want to pick up some more memory) and a video card...
a pretty good HP deal on TigerDirect