Ok, I had the same problem. Tried to uninstall, reinstall, reboot pc, uninstall nokia pc suit, reinstall pc suit, bang my head against the wall. Nothing worked untill.........

1. wiped NSU off my PC completely. Although I did keep the "NokiaSoftwareUpdaterSetup_en.exe" on my desktop.

2. downloaded an old version of NSU. It can be found here:

http://www.qalansawa.net/NokiaSoftwa...erSetup_en.exe

3. I then ran the setup for the old NSU. Once setup was complete, I tried to launch it. It gave me the option of updating it to the new version or exiting out of the program. I chose to exit out of the program.

4. I then ran the setup for the new version of NSU. The one that I kept on my desktop as mentioned in point 1.

5. It went through its usual installation and then to my amazement, BINGO! it worked. I have no idea why it worked but its the only thing that has.

Hopefully it works for you too!!