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I googled probably the whole web but didn't find an answer that would help.

Every new USB plugged printer is recongnized only as uknown device, even after indicating the exact path of the original printer driver. The others installed printers work, just as adding a network printer. Adding a new usb printer results in an error code 28 or error message that the driver has been found but the USB-Printing support is missing.

Adding any other USB devices is ok, only the printers have the problem. Any solution - maybe via cmd?

W7 Home premium 64 Bit

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can you verify on the printer properties (if available) if it is correctly assigned to be used on a USB communication port? – Lorenzo Von Matterhorn Jan 9 '13 at 14:37
sorry, where can I see that? I am not able to enter the printer properties, as it is not recognized as a printer..I am only able to print with this one via network. – dajalydia Jan 9 '13 at 15:52
Go to Control Panel > Devices and Printers , click the problematic printer, and click Print server properties > Ports . See if you can fix the bad port there. (assuming the printer is shown, just not working properly). if it isn't shown, update your motherboard drivers to restore USB printing support. – Lorenzo Von Matterhorn Jan 9 '13 at 15:56
sorry for the late response. The printer is not shown, only as an unknown device. Sorry to ask, but how can I update the motherboard drivers - my PC is not a special brand but a workstation? WOuld there be any other way of restoring the USB printing support manually? – dajalydia Jan 9 '13 at 17:08
try removing the driver from the device window, reboot and plug it in again. wait around 5 seconds and see if it is displayed correcly. also, on the power tab on that device, if it goes over 500 mA you need a power hub. there may also be the possibility that the manufacturer states the printer is windows 7 compatible, but it refers to the x86 version only. – Lorenzo Von Matterhorn Jan 9 '13 at 17:17

I would remove all the drivers in case there is a bad driver which corrupts the list.

Single click on any printer you have in the Devices and Printers screen and this will have given new options at near the top of the screen, under the address bar, you should see Print Server Properties. Click on it.

Navigate to the Drivers tab, and providing you are happy to do so, remove all un-used/unworking drivers. Reboot and try again.

Furthermore, this maybe a known bug and there is an auto hot fix from Microsoft as well as more information.

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Thanks for the response. I just came back to the computer: I tried that hotfix already - that didn't help. It only brought me much bigger problem: the PC didn't boot at all.. The booting problem was fixed by a technician; however, he wasn't able to repair the printer problem. I try the Print Server properties solution - should I just cancel all of the drivers seen there? – dajalydia Jan 9 '13 at 15:31
@dajalydia - That is up to you really. Personally, if it was me, I would as I can re-install them. It would depend on if you can't re-install current working printers, how much of an issue it would cause (in which case, delete most of them, or all but one!) – Dave Jan 9 '13 at 15:34
ok I'll try. I am just afraid if it wouldn't work then I don't have those printers neither.. – dajalydia Jan 9 '13 at 15:50
@dajalydia then only remove the ones you can afford to remove! – Dave Jan 9 '13 at 15:52
sorry for my late response, I'm having connection problems. I removed all unused printers, but it didn'solve the problem. After the printer is plugged in, it shows up straight away as an unknown device. – dajalydia Jan 9 '13 at 17:01

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