B-737 800/900 FMC

I recently purchased the B-737-800/900 In at a Department store in Germany.When I returned to the US I downloaded the B-373 600/700 series, and loaded both programs loading the B-373 600/700 first per instruction, then the 800/900 with the update included on the disk.When I have both programs loaded or just the 800/900 series loaded, the FMS is goofy, when I click on the 7 8 9 keys I gen 4 5 6, and the . o +/- keys I get 7 8 9. Someone suggested click on the bottom of the keys. That worked fine with the 7 8 9 keys but I still get the same result with the . 0 +/- keys.I have tried everything I know, to completely re doing the whold computer and still have this problem.I really like the PMDG software, and the 800/900 is a great upgrade to the 600/700 series but I would like to have full use of the FMS.Any help is appreciated,Thank YouKen Hand