Instead of Domain\Username use .\username in that field and you should be good to go. Of course the "username" needs to have access to the Admin$ on the target machine.
I hope this helps.
Either you can use "." or use "local" so the syntax will be either .\Username or local\username.
Alternatily is it possible to manually install the agents on my 2 workgroup laptops? If so how?
Many thanks in advance.
This might be the easier option - simply copy the framepkg.exe from the ePO server to the clients and run it locally, using an administrator account. (You may have to use "Run as administrator" if the OS is Vista or above.)