SQL issues Trial SQL Server R2 hints that the evaluation period is over and the database cannot access the workaround

Because it has been a trial version, after restarting the server, suddenly the database can not access, prompting the evaluation period has gone, are scared to fright. Fortunately, we found a solution. The special copy resolution steps are as follows:

(I use the Enterprise version: r88pf-gmcft-km2kr-4r7gb-43k4b)

First Step: Enter the installation center in the SQL2008 Configuration tool
Second Step: re-enter the maintenance interface, select Version Upgrade
Step Three: entering the product key, entering the key
Fourth step: always point to the next step until the upgrade is complete.
SQL Server Developer:pttfm-x467g-p7rh2-3q6cg-4dmyb
SQL Server ENTERPRISE:JD8Y6-HQG69-P9H84-XDTPG-34MBB

Data Center Edition:
DDT3B-8W62X-P9JD6-8MX7M-HWK38 (pending test)

Development version:
MC46H-JQR3C-2JRHY-XYRKY-QWPVM (available, verified)
FTMGC-B2J97-PJ4QG-V84YB-MTXX8 (pending test)

Enterprise Edition:
R88PF-GMCFT-KM2KR-4R7GB-43K4B (available, verified)
bcdfg-hjkmp-qrtvw-xy234-6789b (pending test)
Gyf3t-h2v88-grpph-hwrjp-qrtyb

Standard Edition:
B68Q6-KK2R7-89WGB-6Q9KR-QHFDW (pending test)
Cxtft-74v4y-9d48t-2dmfw-tx7cy (pending test)

If the above operation is not connected to the server, modify the system time (put the time ahead), you can log in

If the issue is still not resolved or if the evaluation period is over (it is said to be a bug that SQL2008SP1 is not installed)
First step: first go to the registry to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\100\configurationstate Commonfiles value changed to 3
Step Two:sql2008 installation Center, maintenance, version upgrade again (because the database has been upgraded earlier, so this time only upgrade shared components)

Source:http://www.cnblogs.com/yourancao520/archive/2011/10/08/2201661.html

SQL issues Trial SQL Server R2 hints that the evaluation period is over and the database cannot access the workaround