I posted about this issue a while back with ESS ver 5 where it was causing problems downloading files through Firefox. The problem was fixed by stopping and disabling the windows firewall service (even though windows firewall was turned off the service is still running). Well I had problems with version 5 and removed it and installed ver 4.2.40. Now it's happening again and the disabling of windows firewall service is not fixing the problem. Download after download gets to 99% and then gets rejected saying that the source file cannot be found. It only seems to do it with Firefox. I have tried IE and Opera and there isn't a problem. It is getting quite aggravating because if I am downloading from a hosting service such as Hotfile and I forget to disable protection and the firewall (yep!! gotta disable both) and the download fails I have to wait 30-45 mins to download again instead of the normal 15 seconds!!!! Here is a picture of the problem: http://i227.photobucket.com/albums/dd257/davcataa/ESSError.jpg I am running Windows 7 Ultimate 64 bit with Smart Security 4.2.40. Windows Firewall is turned off as well as the service is stopped and disabled. I am at my wits end and do not want to have to remove Eset and change to another antivirus software. There is no set pattern to this occurrence it just seems to happen randomly but does seem to affect about 75% of all downloads. Any help would be appreciated. Update: Ok it just caused a problem with Opera as well.