Try this:
1) Reboot the PC and log in using the local admin account. Do not attempt to log into OTM.
2) Start --> Programs --> Administrative Tools --> Component Services
3) From Component Services expand the following folders --> Computers --> My Computer --> COM+ Applications
4) Right click and select properties of the OTM Application.
5) Select the Identity tab. Change the radio button from Interactive user to This User. Use the browse button to locate the Local Administrators account and select it. Input and confirm the password. Apply. Okay. Log into OTM.
Let me know if that works. It could also be DCOM is now disabled, or a couple of other things. Or, if that doesn't work, try this:
1) From the OTM Client PC, Go to Control Panel > Add/Remove Programs, find the "OTM Application (Application Proxy)" and remove if it's there.
2) From the OTM Client PC, Remove the OTM Application from Component Services. Steps vary depending on the OS.
a) For Windows 2000 Professional and Windows XP clients, Go to Start > Programs > Administrative Tools > Component Services. In the Component Services window, click on Computers > My Computer > COM+ Applications. Find the OTM Application, right-click and delete if it's there.
c) For Windows 98 clients, ignore this step.
3) Reboot the OTM Client PC.
4) From the OTM Client PC, open a command window and type "ipconfig /all" to verify the hostname and IP address.
5) From the OTM Server PC, Go to Utilities > Client, check the hostname and IP address of the client. Make sure the hostname and IP address of the client is correct, otherwise edit the information.
6) From the OTM Server PC, create the export file to be used by the OTM Client. Steps vary depending on the OS.
a) For Windows 2000 Server, Go to Start > Programs > Administrative Tools > Component Services. In the Component Services window, click on Computers > My Computer > COM+ Applications. Right-click on OTM Application, and choose Export. Choose a location for the exported file for example C:\Nortel and file name for example client. Choose the option "Application Proxy", and the file will be create in the chosen location for example C:\Nortel\client.msi.
7) From the OTM Client PC, if you selected the shared Nortel folder, the file created above is readily accessible. If you selected another location for the file, either copy it to the client or share the directory.
From the OTM client PC, double-click the client.msi file, or from a command line type "msiexec -i <directory path>\client.msi.
8) If you do not see any error messages then the package has been installed successfully and you should be able to log in from the OTM Client.