I'm not sure but just making a suggestion. You must have saved various files from your HDD before you dumped it right? I wonder if you still have traces of LW on your comp. If you use your add/remove pegrams control panel to see if you can remove it.
2. Then make sure your installshield engines are up to date: update your installshield install engine.
3. Update your Java: Java 1.5 (take the JRE)
4. Re-install LW

If your LW Pro is still valid within 6 mths of purchase then you can still re-install it.