Enemy are glitchin'

[Grimples]

Playing through SP again & the enemy are walking through walls, shooting me through whole buildings, this is making the game very tough. Tried different settings in the hnd2 setup program & my grafix card setup, no change. Renamed the mission, maps, models & script folders in case it might of been something in them. I have two profiles & they both do the same.
Any ideas anyone before i have to do a reinstall of the whole game.

Many Thanks

Grim

P.S please don't anyone suggest updating my grafix card drivers because it is utter crap. new is not always better & the game worked fine with the same drivers before, been using these drivers for nearly 2 years with no probs.

[Jason]

Did you recently upgrade the game or something? or maybe a re-install without patching it... hardly seems like a graphics card issue if the enemy walk through walls sounds like it's the game it's self mate