BSoD - 5 month old system

I built my first computer in august of 2008. Over all I am very happy with it, except for the seemingly random BSOD errors. I have searched the forums, and it is hard to figure out where to start troubleshooting.

Windows XP SP3
Nvidia GT 9800
GIGABYTE GA-EP45-DS3L LGA 775 Intel P45 ATX Intel Motherboard
CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor Model BX80570E8400
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ
Seagate ST3640323AS 640GB 7200 RPM SATA 3.0Gb/s Hard Drive

Error on Last Stop:

0x0000000F4 (0x00000003, 0x8AF161B0, 0x8AF16324, 0x805D297C)

If anyone can point me in the right direction or decypher the above error, I would greatly appreciate it.

Thank you~

Thank you!