|Your response is confusing.|
Your OP says the problem is happening with Windows 7 yet you responded by saying that you have a working system that is running XP.
That could still point to a print driver issue since you are using 2 different operating system. Of course since there are 2 different operating systems involved, it could a number of things, but I'd still take a look at the print drivers first.
We found that even with systems running identical OS's and Office versions, there were different print drivers installed - some systems had drivers specific to the printer model while others had a 'generic' driver from the same manufacturer.
One driver worked fine, the other caused the black-box problems that you described.
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