Hpw to connect windows 7 x64 to win xp x32 for LAN gameing?

Publishing your e-mail address no a public forum is a bad idea- it cold be sold to the idiots who ship out Spam.

What you need is simple networking with no Windows 7 Homegroup involvement whatsoever so just open Network and Sharing Centre and allow file sharing and in XP, run the Network Wizard in Control Panel.