Hello,
I would like to clarify I few things from your post and add some additional information. When you say that you are pressing an EXIT button are you referring to a stop button in your LabVIEW code, the LabVIEW abort button or the Exit (X) button located on the edge of the window? If you are pressing the LabVIEW abort button and the program is in the middle of an process, problems might occur. I would suggest using a stop in your problem, if you are not already, to stop a VI.
We have a page which list the supported NI products with Windows XP. Please go to ni.com/info and enter in winxp. From that page you will see that LabVIEW 6.1 is the officially compatible version of LabVIEW with Windows XP.
Regards
R. Blake
Applications Engineering
National
Instruments
Director of Engineering
G Systems, www.gsystems.com
Certified LabVIEW Architect
Certified LabVIEW Embedded Systems Developer
Certified Professional Instructor