The great thing about Windows 7 is that it has a file hook for .iso files. Right click on them – and Windows 7 will offer to write that .iso as a DVD or CD. The one problem is, that it can’t natively mount .iso files – so you can’t see what is in them or extract the contents (unless you write the file to a CD or DVD first).
There are free tools out there that can mount an ISO in Windows 7 – but I have either not been able to get them to work properly or I have seen suspicions in reports that some of them may contain spyware.
Slysoft have a free product called Virtual Clone Drive – which works great and doesn’t contain spyware but it installs some stuff as a service – and I am never sure of the impact of that sort of thing. They do have a really great logo though!
So, step forward the Pismo File Mount Audit Package AKA Mount Control from Pismo. This is free, doesn’t install as a service and works a treat. Job done. This one is a real Woodygem®
Really useful stuff that I bump into..... 
i’ve been using daemon tools to do this for years which works great but this looks like a great option too. cheers