Hi Riix,
You as you have all the patches did you get the "playfix" patch? Do you have the cd in the cd-rom player?
Apparently the v1.3 NoCD crack is at least partly to blame, the fix is to install the "PlayFix" patch.
info From:
http://cstrike.g00se.net/cgi-bin/YaB...?action=recent
Also:
"Note: If you've been getting the "Data Differs" error re-download the patch from here and install over the old one. A beta version of the 1.2 patch had been circulating and is what a lot of people downloaded and installed at first. This new version will overwrite the beta patch and fix your Battlefield. "
From:
http://www.bf1942files.com/file.info...&action=expand