The information displayed when you run the winver command is incorrect as below going by the words of Microsoft.
To clarifiy this,
1. Click Start and search for cmd. Right-click the cmd icon and select “Run As Administrator”.
2. Run the following command,
C:\Windows\system32>cscript %systemroot%\system32\slmgr.vbs -dlv
This should show the software license details and you can see in the last but one line that the license actually expires in August (02.09.2009 on mine)
So no panic just yet!!!