To remove the recurring registration popup:
Windows XP:
Open Registry:
1. Click on START button
2 Select RUN
3. Type: regedit
4. Click the OK button
* Please backup your registry before making any changes *
5. Expand the HKEY_CURRENT_USER folder
6. Expand the Software folder
7. Expand the Corel folder
8. Expand the PaintShop Pro folder
9. Select the X4 folder
10.Right click on the X4 folder and select Rename
11. Rename the folder to X4_old
12. Type %appdata% and then click on ok
13. You will first need to click on the Folder Up button 
14. Find and Left click on the Local Settings Folder
15. Left double click on the Applications Data Folder
16. Rename the Corel Paintshop Pro folder to Corel Paintshop Pro_old
(to rename the folder, right click on it and chose rename from the menu)
Windows Vista/7:
Open Registry:
1. Click on START button
2. Click on All Programs
3. Click on Accessories
4. Click RUN
5. Type: regedit
6. Click the OK button
* Please backup your registry before making any changes *
7. Expand the HKEY_CURRENT_USER folder
8. Expand the Software folder
9. Expand the Corel folder
10.Expand the PaintShop Pro folder
11.Select the X4 folder
12.Right click on the X4 folder and select Rename
13.Rename the folder to X4_old
14. Click on START button
15. Click on All Programs
16. Click on Accessories
17. Click RUN
18. Type %appdata% and Left Click the OK button
19. Click on AppData in the address bar at the top left hand corner of the window
20. Left double click on the Local folder
21. Search for and rename the Corel Paintshop Pro folder to Corel Paintshop Pro_old (to rename the folder, right click on it and chose rename from the menu)