SQL Server 2008 evaluation period has not opened the database, the workaround is as follows

Method one.

 Click Start-All Programs-microsoft SQL Server 2008-configuration Tools-sql Server Installation Center
Then click on the left side of maintenance, click on the right side of the version upgrade, then follow the prompts always point to the next step, to Product Key when the input
Development version: Pttfm-x467g-p7rh2-3q6cg-4dmyb
Enterprise Edition: JD8Y6-HQG69-P9H84-XDTPG-34MBB
It's OK.
If you are prompted for the evaluation period after the above operation, modify the registry:
The "CommonFiles" value in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL server\100\configurationstate is changed to 3, and the above operation is re-executed. 

Method Two:

is the computer to the lower right corner of the system to change the time, change to the first hint you one weeks before the day, and then you can open, open the system time to change back, but this is to open a need to change once, if the basic does not look at the computer time, then change to two months ago. At least you don't have to move for two months. There's no need to re-upgrade anything.

SQL Server 2008 evaluation period has not opened the database, the workaround is as follows