We can try it.
Have you Call of Duty version 1.5?
Have you put the swat folder into the call of duty folder? (Not main)
have you the files as described above in this folder?
Can you remove all custom maps and mods from the main or|and uo folder to a new folder outside from CoD.
Can you please post the logfile from the point starting the game until the point the error apears?
To create a logfile create a desktop shortcut to cod with the entry +logfile 1 +connect 82.98.201.199:32000 in the target row.
the logfile default_mp.log is in the main or swat folder after leave the game.
PS: Do you speak english? :?