Installed NIS (Samsung Netbook, Win7 ) Had 60 day license, dropped straight to 0 days. Why?

Installed a licensed copy of NIS on my little netbook and was told it had 60 days to run.  A little while later, it said zero days.  Is this a known bug?  It's the 'compact' version of Win7 (can't remember the proper name; netbook not in use until I'm sure of the protection!)

 

Help?

Bella