Ok, I have read all the negatives about the game but want to buy it anyway

Once I get it and install it, can you guys point me in the right direction as far as all of the patches I need to install?
Also need a little feedback on my system specs. SH4 runs great on my current machine. Here are my basic specs below, and wanted some opinions on how it might perform. Thanks in advance
P4 3.4 ghz
2 gigs of ram (Going to install 2 more)
Windows 7 32 bit
Radeon 6570 1 gig video card
(2) 80 gig hard drives