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Computer freezes completely

This is a tricky one.  So I thought I'd fish a little for suggestions.  

We have a new Dell Precision 380, loaded with a NI-PCI 6509, and a 6023E card.  The system monitors a couple of potentiometers and some digital inputs, as well as handling communication with an Atlas Copco Nutrunner.  

There is also another application on the same PC written in VB6, that handles barcode code printing (on a serial request) and database integration.  

Initially my LV (7.1) program ran fine.  But after the VB6 applications and printer drivers were initially installed, something "broke" in LabView and I was no longer able to open the Properties of any VI.  Uninstalling and reinsatlling LabView didn't help.  Eventually I formated and reinstalled Windows and LabView; This seemed to fix the problem....until now.  

To try and isolate the problem, I'll try running my LV program separately from the VB6 application.  But in the end, the two will have to play nicely.  

What I'm wondering is if there's a way to possibly find out exactly what's locking things up.  I know there's a million possibilities for this one.  I'm just curious how others might approach it.  

Thanks.  
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Patrick Allen: FunctionalityUnlimited.ca
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Hi pallen,

Your idea of running each application individually is definitely the best course of action. You said that the computer freezes when running both, but later on you said that you were unable to open the VI properties - could you describe exactly what happens? When during the application does this happen?

Another possibility is to use our debugging techniques such as execution highlighting to see where you might be running into issues.

Sorry I don't have more concrete suggestions, but as you mentioned it's a little difficult to isolate where it may be freezing while running a second application concurrently.

-Sam F, DAQ Marketing Manager
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 Thanks for the reply Sam.  

In this case I think I may have solved the issue.  This is actually something we've seen before here.  But it was a couple of years ago.

There really aren't too many things that will completely lock a computer like that.  I had a suspicion that somehow the COM ports were involved, as they had been when this happened before.  

On this PC we're using a PCI Serial Port expansion card from Lava.  Until yesterday I had just been using the driver supplied to me by coworker.  But when I looked on the company's website, I noticed they had another driver for the same model card.  It seems that some cards were built with a different UART chipset, and these cards could experience "occasional lock ups".  There was another driver for these cards.  So far the new driver seems to have solved the problem.

If this hadn't worked, I probably would have tried running Winternals RegMon and FileMon in hopes of capturing the last files accessed to see if that would shed any light on what was locking up.

Hopefully I won't have to do that.  Smiley Happy
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Patrick Allen: FunctionalityUnlimited.ca
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