Can not visit some sites because of too many ads! Is there any virus in my Mac? I need to know that my mac was working perfectly fine till today. I wanted to visit same sites which i have visited yesterday in safari,and they were working perfectly fine, so today when i tried to open the page. It opened for few seconds and then went to another page of ads, where i couldn't see any cross option to close this ad. I have tried other sites to check ,but sadly same thing occurred. Only main site like mac,Facebook and this site working fine. 

Need to fix this issue. Is there any virus. I didn't install anything in mac.
Try BitDefender's freeware tools -  

Adware Removal Tool for Mac
Virus scanner for Mac
Mechanic

The Adware remover you get directly from the link, the others you can get through Apple's App Store.

I would highly recommend keeping the Virus scanner on your machine afterwards &amp; running it periodically.
Macs are not immune to viruses, they're just rare.
The freeware version does not actively scan in the background, you need the paid version for that.

BitDefender is highly rated on official antivirus test sites such as http://www.av-test.org/en/