Firefox.exe-bad image

hi,

recently i began to get "globalroot\systemroot\system32\ESQULjgcfwmbrcqislnpwgbetvemctjiusiiv.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendore for support" whenever i open firefox or IE. I had deleted the program which had put it on there and then restarted my computer. As it booted up it diverted to the section saying start normally, in safe mode etc. and whichever one i choose it would begin to load then just restart. I managed to get back to here after placing the vista cd in and hitting repair software but now i want to get rid of this. After reading some of the other posts i noted things were done differently and people had similar but different problems so instead of stuffing it up even more i started this thread so i could try and get this addressed the best it can be. So can someone please help me.

Many thanks in advance.