VI Run Sporadically Freezes Entire Computer

Hi,
I am having a critical issue with a VI I wrote and I'm not sure why. The VI writes to a GPIB address to control an Agilent DCA, then reads data, then alters a parameter and repeats. It seems that the computer will randomly freeze while the code is running. An emergency restart, holding down the power button, is required to use the computer afterwards. It doesn't seem to matter how many loop iterations that code has gone through before it freezes, I have seen it freeze after just two and I have seen it freeze after 100. The only thing I can think of is that somehow the gpib write and read are causing some critical failure.
Is there something else on the computer that could be interfering/interacting with the VI that causes a system wide shut down? I've had the task manager open and CPU usage and memory never go above 25%. The two factors that have been constant for these freeze ups are that the vi is running and I haven't provided any user input to the computer (such as a moving the mouse) in a couple of minutes.
Thanks

How often is it at 25% CPU? Most likely you have a 4 core processor and highly serialized code, so you are actually running one core at 100%.
The mentioned USB power issue is a good place to start. Do you use any other third party DLLs or drivers?
LabVIEW Champion . Do more with less code and in less time .

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b still
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Adobe Creative Suite 5, student version or what have you.
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xNormal
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note* I have alternated shutting off and turning on OpenGL as well as multiprocessing. Doesn't matter, it really doesn't seem to change much of anything.
Alas, I am absolutely sure, after checking and re-checking 80+ hours over the past 2 weeks that yes, everything is updated as far as each individual program, software or hardware will allow me to update them. I have reinstalled Windows as well as each program up to 3 times, and 1 system (restore?) I had Windows dump everything, started from scratch, backed up nothing. To reinstall everything from scratch, while not installed several "Utilities" or software components from stuff like the Motherboard and its XFAST USB/LAN or whatever, thinking maybe it was cluttering up anything.
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note* I do not have a wired Keyboard or mouse to disable the USB plugin and attempt that route.. at least not yet, its on my list of things to do. Also, I did run Memtest86+ during a boot and it claims that everything there had passed 100%. I am not "overclocking" anything either. I just wanted something I could work smoothly on, that would have decent rendering capabilities. I used to use my girls' laptop which was an HP with 3GB RAM and never experienced crashes or freezes and I could use AE, PPro, 3ds Max with some lag but not any issues. Rendering took forever on it, but I usually avoided that 'cuz it would start heating up pretty fierce. Saved my rendering for school computers where I could. But either way, now I have this expensive piece and it is getting frustrating that I cannot work on it.
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Thanks all. I have just tried a few things, installing them onto the C drive as you all specified as not being one of them. I can understand it, but at the same time i have a classmate who has their software on a seperate drive and it runs smoothe. I'm on my second GPU in 2 weeks, unless I have terrible luck it seems doubtful being that I can run games and a majority of the software no problem. Through further testing around with a corded mouse and keyboard I've noticed the following...
The computer freezes entirely only when I'm performing a "scrubbing" action or using a mouse. Left clicking, scrolling, or moving it around. Otherwise if I do not use the mouse and I make all my actions, such as "scrubbing" in AE via "Page Up & Down" keys, there's no freeze and it preloads the preview no problem.
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Is it possible my motherboard could be incompatible somewhere? I mean, really.. everything is brand new but 2 weeks of troubleshooting.
And I do plan on trying to run my software off the C drive, I just wanted to make sure it wasn't something else, like I said, I've seen and used a computer where it all runs off the D drive and it runs perfectly, actually better on his computer than off the C drive at my schools. So if it is an issue would it lie within the fact that I'm using an Nvidia GPU? Considering my classmate is using a AMD/ATI Radeon or something like that.
Again, to those who replied, your shared knowledge is greatly appreciated, thank you.

ITunes is causing entire computer to freeze.....

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I have not been able to use iTunes for several months. Every time I open iTunes, it freezes by computer such that there is about a minutes between each action. I am running iTunes 11 on Mac OS 10.6.8 and have a computer with maxed out memory.

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VI Run Sporadically Freezes Entire Computer

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