As everything else apparently works OK, the problem is the EQ7 program, not your PC.  Either it's not compatible with Vista or it has an installation problem.  Your first step should be to contact EQ7 for assistance on installing their program. 

Keep in mind the PC does not have to be compatible with the program, the program must be compatible and work with the PC.  Or another example, if you have a Ford car and buy a Non Ford manufactured aftermarket accessory and it doesn't fit properly, it's not Ford's problem to make it fit, it's the after market accessory companies resonsibility to make a product that dies fit.

Have you posted this question on the EQ forums? They have a Tech Forum & Tech supprt it looks like.........

Jeff

I haven't been on the EQ forums but have been communicating with a very helpful member of their technical support team but as yet to no avail

As everything else apparently works OK, the problem is the EQ7 program, not your PC. Either it's not compatible with Vista or it has an installation problem. Your first step should be to contact EQ7 for assistance on installing their program. Keep in mind the PC does not have to be compatible with the program, the program must be compatible and work with the PC. Or another example, if you have a Ford car and buy a Non Ford manufactured aftermarket accessory and it doesn't fit properly, it's not Ford's problem to make it fit, it's the after market accessory companies resonsibility to make a product that dies fit.