Hello Bibek007

This error may be due to a corrupted ALM database. You could try the following:

- Unistall the ALM and make sure to delete almdb.sdf file (usually under C:\ProgramData\Siemens\Automation\AutomationLicenseManager\logging\). Then, install it again

- Try reinstalling WinCC. To uninstall it properly follow this section of the manual: Uninstalling WinCC. 

Also, I recommend you to store the license keys to avoid losing them (ALM manual) and to backup the project (How do you do a data backup of the WinCC Project (WinCC V7 and WinCC Professional) on the Operator Station (OS)? 

Good luck!

Hello Bibek007

Please check at first if your WinCC version is compatible with the used OS:

https://support.industry.siemens.com/cs/de/en/view/64847781

Which SP do you have installed in your WinCC V7.0? not every SP is compatible with Server 2008 R2

Bye Murof