Intel V12 and Win7SDK 64bit incompatible

I'm having some problems with windows 64Bit machines XP & Win7

I have Intel Fortran 2011 Update 11 (V12) installed and works using PSCAD

But if I installed Win7SDK for use with Matlab 2012b then the fortran compiler stops working.

Even after uninstalling the Win7SDK the compiler wont work.

Any Ideas?

Thanks, Gavin