I have had this happen in the past.
Now be aware... this is a gamble, but it worked for me.
First uninstall TS12, if you can. If it will not uninatall, and it didn't for me,
you will need this software.
http://www.piriform.com/ccleaner/update?v=3.13.1600&l=1033
Its called ccleaner, or to computer nerds, crapcleaner.
First using WindowsExplorer, find the folder in Programs titled N3V.
Highlight that folder and delete it all. Then run CCleaner, not once, not
twice, but untill it finds nothing. Then, again using CCleaner, use the
registry option, and fix any errors you find. No need to save anything
using this option. Again, not once, not twice but several times.
When it reports no errors, run it again for safe keeping.
Then reinstall TS12 as if you've never done it before.
Hopfully this will work for you. It did for me.
AL