Its probably the game itself. Try some other games (ie. Crysis demo
[big file 1.3GB], Halo CE [128mb], etc ) and see if that still happens. looks like python25.dll has something to do with the Python language/scripts. This could have been installed through the game itself (for Multi Player ??)
I searched for python25.dll in 4 of my PCs and its not there, so looks like its installed by the game. Esp. since the game is MMORPG.