Bettersurf Ads

Hello friends,
Today when I logged in to my website, Google chrome displayed a “Malware Ahead” window. Upon proceeding, I found that my website is full of “Bettersurf” ads and a software named “Yet Another Cleaner” started downloading (which I cancelled). My website is knocked down for all search terms in Google SERPS. I need some help.
1-How do I remove this malware from my website?
2-Will my Google SERPS regain after removing the malware?

Many thanks!