well... ive had this happen many times. i know somwhat what it is. some programs downloaded in .exe form can look like viruses to a computer. i know every time this happens to me my antivirus tells me that a virus/trojan/things like that was deleeted. if you have antivirus this may be ur issue if u dont than a. get some cuz therez nasty stuff out there and b. it may just be a coincidense that any files that cannot be downloaded appears as viruses to my software (hope this helped a little)