check is server is being used
open dos prompt: type : net use
Status Local Remote Network
-------------------------------------------------------------------------------
Disconnected \\S-IJS-EXC-020\IPC$ Microsoft Windows Network
OK \\S-IJS-VSH-006\IPC$ Microsoft Windows Network
The command completed successfully.
also is the status is disconnected.
then net user //servername /delete
then to double check if the server is really gone net use again
C:\Windows\system32>net use \\s-ijs-exc-020 /delete
\\s-ijs-exc-020 was deleted successfully.
C:\Windows\system32>net use
New connections will be remembered.
Status Local Remote Network
-------------------------------------------------------------------------------
OK \\S-IJS-VSH-006\IPC$ Microsoft Windows Network
The command completed successfully.
then you can install the agent.
good luck!