Converting MOV. (QuickTime) to MPEG? I just can't do it.?

I have tried every software I have and download more but still cannot convert my QuickTime movies to MPEG. I usually use Blaze Media Pro but I get a Runtime error even after installing the need Windows Media Format (WMF9) file. Then I trien TMPGEnc and get a "file not supported" message. Any help?