Windows 7: Fallout 3 Mount Image

ok... so another little fallout 3 question.... i bought fallout 3 a couple of weeks ago and so me and my brother could play i made a image of it and mounted it worked perfectly fine until today when i tried and it came up with some error message " Conflict with Emulation Software detected.
Please have a look at SecuROM for further, more detailed information."
And i have the original disc which is no problem to use but just easier using a image is there a reason it worked fine till today havnt changed it or anything.. and its very weird because i actually played fallout 3 earlier today and worked fine on image but later now when i tried came up with that message... anyway if you could help me fix this so i can run of image that would be great but if not ill just use normal cd
thanks in advance



PS: just a bit more info i used magicdisc to make the image and its in UIF format