After seeing this post go unanswered I will hazard a guess---your Lexamark drivers failed to install correctly. If this a new unit--talk to Lexmarl tech support--but even then it may be worthless.
I had a similar problem with a Lexmark---it ended up being with a windows dll that was moved as windows was updated--and when the driver software could not find the dll in exactly the expected place it did not install correctly. The driver software only worked partially---I finally got it corrected no thanks to Lexmark tech support.
My suggestion is to (1) talk to Lexmark tech support. (2) If that does not work---take the unit back for a full refund--and explain to the store its Lexmark's job to write drivers that install correctly.--your OS is hardly new or unconventional.--its Lexmark's lookout not yours.