Can't update to 16.5.0.135

I had NIS 2009 Greek 16.5.0.135 installed on my PC. I visited the Norton Update Center which prompted me to update to a new version. I did so. What happened was that my Greek-language installation was removed and NIS 2009 English-language 16.0.0.125 was installed. I removed it using the Norton Removal Tool and installed my Greek-language installation from the CD-ROM. The problem is that it is stuck in 16.0.0.125. I run LiveUpdate every now and then, with no results. Another issue is that I can't install the hotfix so I can have Norton Toolbar on Firefox because the hotfix requires NIS 16.5.0.135 to run. I would be grateful if someone could help me with this...