Problems after creating a repaint

Hello All,I made a repaint for the iFLY 747-400 on FSX and i'm having a few problems with it. Ever since i made it, i have been getting errors. I got a runtime error which i don't see anymore. I have recently gotten an error where FSX just freezes and gets a CTD. Most things were fine before i uploaded this repaint but i managed to get some long haul flights in. But every once in a while, its been freezing from when i made this Repaint.When i tried to upload it onto AVSIM, it detected a virus but i didn't add anythign new. I ran it with my virus scanner and it was ok with no problems.Any ideas on what went wrong??Thanks