I believe Windows products already have Remote Desktop capability and you don't require any addt'l software other than the OS CD. (but I may be wrong with other Windows version). Whatever you do, research about reviews and credibility of the Remote Desktop software you're referred to because it's crucial to keep and protect your PC. Cheers!
I use Ultra VNC on my home network (PDA>laptop/desktop), and use it over Hamachi when I'm not here. http://www.uvnc.com/ https://secure.logmein.com/products/hamachi/vpn.asp?lang=en Both are free.