I will be no good with technical questions, but an initial question.
What is it about your 64 bit Windows 7 that is incompatible with your client? It isn't clear why you need to have a 32 bit Win 7 installed on this computer.
I gather HTPC means Home Theater PC.
First, let me explain why. I work for a client that only supports 32-bit OS Windows and my main computer is 64-bit. I'm currently using the computer I built to be a HTPC for work since it's 32-bit Windows 7 system. I'd like to take the HD out of the HTPC and just install it into my main computer at my desk and dual boot them.
I'm assuming that if I could dual boot them, I'd have to install Windows all over again and buy a new product key, MB drivers and all that (yea, looks like a new install). Anyway, I'd love some direction on setting up a dual boot without screwing up my current system. It's really annoying without a KVM switch (they don't work anyway) and I really need the space back on my desk. I'd appreciate any suggestions on how to accomplish this.