HTPC advice

[sunlinux]

I have

HP Pavilion, 1Gb ram, 160 GB sata, PentiumD 925 (P) DC 3.0 GHz, Chipset ATI Radeon Xpress 1100 for Intel Processors.

What I want use it as HDPC to watch FULL HD movies with ch5.1 Sound on my 32" LCD TV.

Pls suggest what up gradation I need to make like Graphices card, audio card etc.

connectivity like HDMI is must

 

[spirovious]

Did you read this-
http://www.hifivision.com/home-theater-pc-htpc-media-pc/6273-plan-new-pc-setup-htpc-5.html

Your current processor can be weak for HTPC.