Parallels Coherence Help

I am using a trial parallels and will probably buy it if I can figure out this coherence problem. It is always grayed out and I cannot choose it. Does anyone know why this is? Did I install windows wrong somehow or is there some setting in parallels to make me be able to use coherence? I did not change any settings, I just did a default install from a USB ISO of Win7. I also did 64 bit if that matters.