12hrs Trying To Play SH5 Sheesh Almighty

[Defiance]

Hiya's,
Had SH5 for 12.5hrs

Almost threw the damn dvd through the window

I need help please lol

In 12hrs of play i've managed to get online to choose a game, sink 1 ship

I am getting stuttering as i move around (at best, or worst a lockup requiring hard reboot)

If i make it up on deck to use the uzo or below the periscope i'm lucky, then if real lucky i get to sink the initial ship that's parked just off my bow

Here's some rig specs ..........

X48 mobo
8 gig DDR2 running dual chan
2x4890 in crossfire, or i disable xfire
Quad Q6600 @ 3.6gig
Logi G15 kb and 518 mx mouse
Vista x64 ultimate
ohh and a Xfi Xtremegamer card

Res option in game set to 1920x1200 @ 60hz

I am now renaming the sh5 .exe to FEAR in hope xfire may work

I am now upto using cat 10.1 from SH4 9.7 i used to use

No idea what to set CCC settings to (eg: set AA there or leave it for the driver to run to mommy n see what the games set at for AA)

Any ideas/suggestions be much appreciated as i'm starting to get slightly peed off now

Cat settings/Game settings, anything replied i will try

Don't mind running one card just so long as i can play the game

Cheers

Def