Security certificate has been revoked
I was able to access the same two sites in other browsers.
Upon Googling about the error I found that my system has been infected with malware. I did System Restore (using SysRestore Pro) but failed and system was unable to restore to previous state. Then I tried to run the antivirus scan from Micrsoft Security Essentials but the application was unable to open. Also whenever I downloaded/open any antivirus/anti-malware or such similar kind of tools, it denied each time, throwing different errors for each application. Moreover the antivirus application downloaded was considered as a virus!!! (too funny) and downloaded remain incomplete
I then tried to use Windows 7 System Restore but that too failed and after some steps of system recovery it threw below error
Windows failed to start. A recent hardware of software change might be the cause. To fix the problem
1.Insert your Windows installation disc and restart the computer.
2.Choose your language settings, and then click "Next".
3.Click "Repair your computer."
If you do not have this disc, contact your system administrator or computer manufacturer for assistance.
My concern here is how to remove malware from the system once I start my PC??