+1. Here's a response to a C&D letter that was probably cranked out from a template (feel free to use it as a pattern!), and you can see what a [real] lawyer does to it. http://abovethelaw.com/2013/06/how-to-write-a-great-response-to-a-cease-and-desist-letter/[^]

VPN is the one thing I've really heard of problems with on 64-bit. Some older devices may have problems, but practically any major brand device built since Vista launch will have both 32-bit and 64-bit drivers. If you need it for work, you are probably stuck with 32-bit for support, though. (Put your old 32-bit XP image w/VPN in a VM?)