Assertion Error
 

I think i have two different types of errors. 1. The first one occurs after the first round of play. Everything runs great and then all of a sudden it just diconnects and takes me back to the main menu. 2. The second error just crashes the whole game and tells me that an assertion error occured on line 5035. Here are my specs.

P4 2.4G
256MB PC/2600
Windows XP Proffesional
AA v.1.2.1
nVIDIA drivers 40.81?? (newest)
Directx 8.1


Any help would be greatly appreciated.