Attempting to start Arc from the command prompt produces the following error message:
"Unable to locate the dll: the dynamic link library elib.dll is either corrupt or not installed."
The system environment variable PATH is limited to 128 characters.
Edit the PATH variable by moving the entry <drive>:\arcgis\arcexe81\bin to the beginning of the value string.
For help with setting a system environment variable, see: How To: Edit an environment variable.