The problem isn't with Poker Tracker, it's with PostgreSQL. You can start a new ACCESS database but not PostgreSQL until you get this problem fixed.
Here is what you will need to do to fix the problem since you never backup the database.
1. Create a new folder on your C 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 c:\PostgreSQL_Data folder 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 c:\PostgreSQL_Data\data folder 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.