I have a HP Compaq (refurbished)?

I would like to upgrade my cpu and gpu so i can play games smoother and render faster on sony vegas. I was thinking about getting the Intel Pentium E6800 cpu but i'm not sure whether it's worth it. Since it doesn't come with a built-in gpu, I was wondering which one to get that will fit inside my pc. Most gpu's are too big. Can someone please suggest a decent one I should get and whether that cpu is a good combination? The main reason for upgrading is to play Amnesia, Minecraft and to render faster in Sony Vegas Pro 11. Right now it takes 12 hours to render a 12 minute video. I can play minecraft ok but it's farely laggy. I can't play Amnesia at all which is a shame because I would love to play it.
Any help would be greatly appreciated, thanks.

My PC Specs:
Intel Pentium D 945g cpu 3.00 GHz Dual Core
4GB Ram
80GB Hdd
32 Bit operating System
Windows 7

Sorry your laptop is non upgradeable. There's nothing you can do apart from keep it defragmented. The graphics card is soldered to the motherboard and not upgradeable
on some laptops it is possible to upgrade the CPU if they are socketed. However it may not be advisable, often the laptop has to be completely dismantled to get to the processor and you risk damaging many of the delicate cables and connectors if you are not used to doing this sort of thing. Also you may be running the laptop outside of the manufacturers intended specs, so a faster processor often generates more heat so the fans may be working harder and more noise, the battery life will be less if there's a higher power draw, the BIOS may not recognise the different CPU.
Most laptop CPUs are not sold direct to the end user only to the trade or manufacturers. As most of these CPUs are not current, then you would have to source off eBay or amazon. Finally most workshops would refuse this sort of work as you would be taking the laptop outside of the recommended specs.

your idea is a non-starter you need to buy a more powerful laptop
David