1052 version with error

hello, I can no longer play the crossfire after days updated 09/16/2010, I downloaded the version here on the site in 1052, when I start the game it starts loading and suddenly the message (FILE IS CHANGED: W [2007] L [5] CROSSFIRE.EXE and later is accused as viruses.
would like some help urgently if possible because i love crossfire.
I thank anyone who can help.