I have been trying to login to my system and it keeps bringing up a fatal error that my comm32.dll file is missing, how can I fix this...?

We could help if we had more details.

The comm32.dll file you are refering to is part of Windows. These files become "lost" due to improper software deletions or reinstalls, spyware, etc. As Bigdog3c says, more information is needed, like what operating system are you using? Did you just install or uninstall software? Had a virus in the computer? There are many sources on the Internet for replacement DLL files so that may be where you want to start. Also, this topic may be better answered in the Computer section.