Fixed Problem - not even Oracle related!!!
This thread may be closed. The problem that ended up being the root cause of the ORA-03113 error was that a DNS server on the network was reporting an incorrect IP address for the remote host. When this computer attempted to connect it could not resolve the host name to the correct IP address. After correcting the issue with the domain name server the ora-03113 error was resolved. This was a situation where only one alias in the tnsnames.ora file was reporting this error, and the alias had previously worked without fail. Why the DNS server suddenly came up with an incorrect IP address I will may never know. Win2000 and active directory to thank I guess for this problem.