Need to upgrade for gaming

[Alfman]

Fist post all a bit of a noob with PCs but I know u can help me out

Here is what I have not sure if i can post my make
Advent T9101
Intel pent 4 3.2ghz
200 gb
512 mb DDR
SIS661fx graphic chip on board

Play a lot of gaming and want to watch Dig. TV and record also
Had the pc open to day 1 slot for AGP
So looking forward to your posts to see how u can help me out TY
Anymore questions I will try and answer
ps I am going to try and build PC in a few months time just want to try and upgrade this one first

 

[Alfman]

ty for the quick replys

I will be making a new PC in the next 3/6 months
Just wanted to upgrade this one
I can spend whatever but as long as it it is worth it not sure if it is worth spending £300 to £ 400
This pc will be a second one in a 3/6 months for the my kids to play with

ty for help

 

[Alfman]

So get an extra 512 mb and go for 6800GS or a 7800 GS which card is better
They do TV also ?