just install to f drive m8 and when u boot up it will say
Boot Win7 or there will be an option to go to Older Windows
This way u can have both OS on your system.
I have done exactly what u are about to do as drive C: was my main drive but for win7 i just installed to Drive E :
It wont affect anything at all on your c : Drive as from boot up you can simpy choose which OS u want to use.
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