You have maybe 3 options here. 1) You can look on your CD and see if you can find a setup program for it. 2) Download it from the internet. Just search for MSJET and it should give you a location to get it from 3). Re-install
I would choose number 1 or number 2 since it would be simpler. I hope this information helps. There may be other ways, but this is the way I know how to do it.