Winword.exe error

I have a PC running Win2000 and Office 2000 for Small Businesses. I have it networked to another PC but if that PC is not on, I get an error when I open Word and get an error saying “there is an error running Winword exe file” and then it closes down. If the other PC is on it works.
I uninstalled Office and reinstalled as a standalone PC and have nothing mapped.
I installed SP3 for WIn2000 and Office updates.
Any ideas,
Thanks in advance,
Mike