I'm getting an error message of "Missing file", although it exists

[el007]

I installed the flight simulator FS2002.
when i try to connect to "737-400 Flight Management Computer" i get an error message of "Run time error '76': Path not found".
What do i do?

[ToddNicholson]

The install was not successful. One or more files is either missing or corrupted. I suggest you uninstall the 734 using the Add/Remove Program files dialog, then restart your computer. Next, reinstall the 734, making sure to turn off any firewalls, antivirus software, file-checking software and malware software that might be running in the background. After installation, REBOOT your computer before running FS.