Zsuqkmk.exe/sis on my 6600

I have this problem with my 6600.. its whenever i try to open a new msg in my inbox, a msg will appear on my outbox trying to send an mms msg (a photo) and whenever i try to put it in my drafts to view its content, i cant open it... also, when im trying to reply or send a msg to a recipient number, two msg will appear in my outbox, 1 is the msg im trying to send and the other one is that mms msg that i am talking about... i tried to reformat the phone a many times and same as well with my memory card and tried to scan both for a virus but still it's still like that... i also got a file in my phone system named 'zsuqkmk.exe and zsuqkmk.sis' and when im trying to delete it, it says that i am using it and i cant remove it... i think i got a virus or something... can someone help me? i need to expertise on this badly.. thanks in advance...