Facebook sign in problem

Hello,
My Facebook account is not opening.once if i sign in it is displaying

Your Computer Needs To Be Cleaned
It looks like your computer is being affected by malware. We'll help you fix the problem to keep your account secure and prevent malware from spreading to friends.
Malware is software that tries to steal personal information and causes problems when you use Facebook. Clicking or sharing links that contain spam can give your computer malware.

and also it is asking to run ESET scanner.I have downloaded and ESET scanner but is not opening.

please help me to solve this problem.