Hello,
Technically speaking, the following are supported operting systems for versions 6.0 and 6.1 of LabVIEW:
LabVIEW 6.0 - Released December 2000
(Windows 2000, ME, NT, 98, 95, Mac OS 9.x* Sun Solaris 2.x and HP-UX 10.x, Linux x86)
LabVIEW 6.1 - Released December 2001
(Windows XP, 2000, ME, NT, 98, 95, Mac OS 9.x* Sun Solaris 2.x, Linux x86)
Thus, you'll see that LabVIEW 6.0 was not officially tested on Windows XP.
I hope this helps!
Best Regards,
JLS