I setup Mach3 on a XP Home computer (it has necessary requirements for Mach3-fresh install of XP Home SP3). When I go to open the MX4660 profile, it freezes my computer and I have to power it down. If I go to load Mach3 Mill, it opens without issue.

I was running Mach3 on a laptop with a TB6560 board, so as a test, I put the MX4660 XML file in Mach3 folder and it loaded there just fine...

Any suggestions as to the problem?