Just noticed that too and then found this thread. This is really outrageous! A driver that copies all the user / computer data from the C drive to its own folder is somewhat scarry... Has the look of a malware infected driver.
Has anyone found a good solution to this? We are having this issue in one of our sites and they have 2 Xerox 7830 devices, printing via a Windows 2008 Print Server. The driver installed on the printers on the print server are the Xerox 7830 PCL6 driver, NOT the global print driver.
I can only think that maybe, at some point, the global print driver was installed, and is remaining on the user's drive? How do we delete them?
It turns out that downgrade didn't help, and as soon as I tried to print again, the DCP directory expanded again. I had to delete network printer and Global Print drivers completely, then install printer specific drivers (in my case Versalink C7030), and connect printer again by IP, so it will use C7030 drivers instead of installing Global Print driver by default.