every thing i download has a T-xxxxxxx(a seven digit #)is added as a prefix to what ever filename i download this only started happening yesterday what up

Don't download or share those--they are incomplete files and should be hidden in most search results. Some people incorrectly share them and pollute results.

(The T-num is the size in bytes of a full file and prefixed to the file name in the incomplete folder. Once all those bytes are completely the file is moved to the complete folder and the prefix is deleted)