Error code:0x8007007B while activation of MS-Office Pro Plus 2010

One month ago, I have undergone a virus software attack leading to reset of my pc, all of my files were intact, just applications and features were removed. Then I installed Microsoft Office Professional Plus 2010, and now I am getting this notifications regarding activation key. Look at the screenshot below.

Then, I entered Product key, it was perfectly accepted and the and the installation process was then completed.

But, then, when I relaunched the programme, it again asked me for activation Key. However times I enter and make my MS product validated, in the very next time, it always shows me that obnoxious Activation Wizard.

I have seen this discussion, none of the workarounds suggested there, worked for me. I never got an run as administrator option upon right click, which was one of the suggestions stated there.

Also, followed some discussions like this, this and this, but those are different problems.

Just the link of discussion in MS site was reasonable, but that didn't solve my problem.

Any way out?