A couple of things *May* fix this issue.
1. Try resetting your cable modem and router, ect. Make sure to leave the modem off for around 20 seconds before plugging it back in. (Make sure your computer is completly OFF before you do this or it wont give you a new ip setting from your modem/router. This will usually fix your communication problems with servers.
2. If that dont work, try reinstalling. *Make sure you delete every part of combat arms. *Do a unistall and make sure to check if anything got left behind and delete it.*
3. Go to your internet options and turn your settings on low on your , Cookies, security, ect. (Just until it gets done downloading.)
4. Make sure your firewall is OFF and any virus protection/shields are off before downloading.
5. Somtimes this just means the servers are so busy they tend to cut ppl off who are downloading from them.
6.Have a hapyy dance if it fixes. <(''<) <( '' )> (>'')>
Idk.. i found it on they're forums LOL.