Installing portTB wiped my local copy

I downloaded portTB and installed it on my thumbdrive - no prob. Copied my preferences across and got it all set up. Sweet. Then I ejected the thumbdrive and went to open my local version of TB and (argh!) I get the New Account Wizard opening up and a blank TB.

All the files appear intact in my App support/etc but TB is not picking them up. I am running XP.

Any help gratefully appreciated