keyboard not working after install ms office. driver problem

[gotsaed]

the keyboard and pc are Medion,delivered together, only a month old and it worked fine untill ms office install. I have already downloaded driver from Medion ,plus udate driver from MS.: win8 answers- driver deactivated - another driver is installed now - the best driver installed. I tried to put the old driver back but it is now unreadable/currupt even though I dowloaded new one.
 I get this answer in device manager:
Windows can not start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)

there is a HID-keyboard device driver - configuration information (in the registry) is incomplete or damaged. (Code 19)
there is a HID-compatible device driver - this is the one installed with ms office apparently
if i update/deactivate or remove - i get  HID-compatible device driver
if i choose the HID-keyboard device driver after removal - configuration information (in the registry) is incomplete or damaged. (Code 19)
always back to start  

PLEASE HELP i'm really tired of using monitor keyboard.

[Geek-9pm]

That should never happen. Consider retraining the system for a full refund or exchange. A typical user should never, ever have to trouble shoot a new computer over such a thing as a keyboard malfunction.
I would gladly give some ideas about how to fix this, but I think it is just morally wrong for a user to try and fix something the maker overlooked.  Ask the vendor to take responsibility for your problem. I really think you shod.