I highly recommend you to update your anti-virus and to run a full system scan.
files from cs2d.com (including the listed mirrors) are clean and not infected with any virus or any other malware.
so there are just 2 possible options I can think of:
1. the anti-virus has a some kind of malfunction and detects a virus which does not exist (which is strange since avira doesn't find a virus in this file at my - and other people's - system(s))
2. your pc was already infected (the infection comes from another source). the virus infects other executables. this is common for some kinds of viruses. so check your full system and get rid of it.