if by x64 you mean win xp x64 i don't think you have to do anything - 32-bit software runs emulated wiht very little speed loss:
"Thirdly, one of the indisputable advantages of Windows XP Professional x64 Edition is the ability of this system to work not only with the 64-bit applications, but also with the traditional 32-bit applications without any functionality limitations or performance drops. This is possible due to a special x86 Windows on Windows 64 (WOW64) emulator built into the OS."
taken from here:
http://www.xbitlabs.com/articles/cpu/di ... rc1_2.html
/r


- By Mark Bell