1)check out offical forum or check out for a new patch...
2)have u tried changing ATI Drivers maybe previous versions...
even though its 90% game problem making sure is better
P4 3.6Ghz 2MB 64bit
2GB RAM DDR2
Geforce 7800GT
250GB 16MB SATA2
Zalaman CNPS9500
-=The Doom Master=-