Moving a Groove account to a new computer.

I have a very frustrating problem with migrating a Groove account from a PC with Groove 2007 (Office 007) to a new PC with Office 2010 sharepoint workspace. The procedure for doing this is to export the account from the old computer as a .GRV file. Now when you run Sharepoint workspace 2010 for the first time on the new computer it asks you if would like to import a GRV. You say yes to this prompt and it then asks you for a password - this is where the fun begins! We have never specified or used a password with Groove so obviously we don't know what this is. Of course we have tried our domain password, blank password etc.. nothing works. The obvious solution would be to go back to the old PC, set a password on your account so you know what it is and then export the GRV again and import. Unfortunately you can't do this because once you have tried to import the previous GRV with the unkown password Sharepoint workspace rembers this and keeps prompting you for this password without giving you the option to re-import a new GRV. Does anyone know how I can either a) reset the current GRV import so that I can do the new import or b) tell me what the old unspecified password might be. It must be some default password.