Error Code 37 running labview 6 with windows XP

Question

I've checked most of the posts concerning this Generic error code 37. Here is my dilemma..Currently running Labview 6 on a windows NT system. That computer is on its last legs and we want to upgrade to XP...I installed labview 6 on an XP machine and the program runs fine..and I actually get data from my external device except I get the ERROR 37...The big thing is I cannot run a SUBVI that creates a linear fit because once I get the error 37, the SUBVI stops. I can't understand how I can read data from my external device, yet get the device not found msg. I've even tried installing LV 7, and LV 8 yet get the same results.
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Answer 1

Thanks for the information...Unfortunately I tried all the suggestions and still no luck. The weird thing is I can get individual data from the analog device to output from the VI (i get actual data to show where it is supposed to show in the output boxes), yet I still get the "ERROR 37" message. The one big problem is that I cannot standardize the device through the LV program and therefore the individual data is not calibrated properly. In the standardize VI, the programs runs through a series of samples, and creates a calibration curve. Then when we run individual analyses the calibration curve is used. The problem that occurs in the standardize VI is that the program doesn't advance past the first sample (error 37)so I cannot generate the calibration curve.
All of the suggestions are greatly aprreciated. What I really do not understand is that without changing anything (just copying files from one computer to another) how the error code comes about. One thing I am going to try over the weekend is to add another COMM port and see what happens.
This may seem ignorant, but How do you "CLOSE" a COMM port???