I m unable to login Server 2003 R2 SBS it showing following Error : "A problem is preventing Windows from accurately checking the license for this computer. Error Code : 0x8007007f"

0x8007007f means that there is a problem preventing Windows from accurately checking the licence for the computer. You should repair your operating system to solve your problem.

http://support.microsoft.com/kb/914232 I hope this information is useful.

Hi Praveen, Since this issue is related to SBS server, I suggest posting the question on SBS forum which I’ve listed as below. http://social.technet.microsoft.com/Forums/en-us/smallbusinessserver/threads The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other customers who access the forum regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding. Regards, Karen JiPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. This posting is provided "AS IS" with no warranties, and confers no rights.