unable to load

I receive a message, c:\windows \system\vmm32.vxd: missing unable to load. Since this has happened I cannot boot up without problems and I can’t use my printer even when I re-install the software. Can I fix this without reloading windows 98? Where did this go? How can I retrieve this. I am not sure how this happened in the first place. Any help would GREATLY be appreciated! Thank You!