Problem in facebook account

when I entered my log in id and password then this shows
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.

when my friend entered his id and password on my laptop his account work properly.
On mobile my account work properly.
But when I log-in on friend laptop above error occur.
kindly help me...............