Windows 7 Networking within XP Virtual Machine issue

Peer 2 Peer network (3 machines)

1 new machine with W7 Pro running in XP VM environment (machine A)
2 machines XP (machines B & C)

Testing only A and C at moment - will apply settings to B when A and C are working

Set up an administrator user account with password on A for the C machine
C sees A and a login screen for A
Login fails due to A not accessible or permissions error.
Turned off user account protection A and no change.

Any ideas greatly appreciated.

Wish I had bought downgraded OS to XP, would have been simpler, but wasn't aware of that option at the time of purchase. So here I am.

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