Here is what I usually tell people to try...
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1. Create a new folder on your external drive called PostgreSQL_Data.
2. Go to the c:\program files\postgresql\8.2 folder. Right-click on the "data" folder and select "Copy" from the popup menu.
3. Go to the newly created folder on the external drive and right-click and select "Paste" from the popup menu.
4. Now, go to the Start menu and select Settings > Control Panel > Add or Remove Programs and then remove PostgreSQL 8.2 from the list.
5. From the Start menu again select Run. On the window that opens type "COMMAND" and hit OK. This will open a DOS window. Type the following next to the prompt...
net user postgres /delete
and hit ENTER to run it. Then type EXIT to close the DOS window.
6. Now, download and reinstall PostgreSQL as directed here:
http://www.pokertracker.com/products/PT ... nstallSQL2WITH THE EXCEPTION THAT on the second window where it asks you where you want to install PostgreSQL click on the "Data Directory" button and navigate to the PostgreSQL_Data\data folder on the external drive and select that. This will force it to try to reuse your old data.
CONTINUE until you get to the window that has the "Initialize Database Cluster" box at the top left corner. UNCHECK THIS BOX and click the Next button and then just continue installing from there.
7. Once the install is done, RESTART YOUR COMPUTER and then try to open PT again.