Q: I have macbook pro and am on OS X Yosemite 10.10.2 . I am having lot of warning message on my browser that my computer is infected with malware/spyware and use mackeeper. How do I solve this issue . This is happening more on chrome and Safari browser

My two cents again: why would you believe someone with unexplained fossil scripts who is recommending against honest reputable contributors here?

You said:

How do I know if I have installed mackeeper

But in your first post you said:

I have macbook pro and am on OS X Yosemite 10.10.2 . I am having lot of warning message on my browser that my computer is infected with malware/spyware and use mackeeper.

That is why we assumed you have mackeeper installed.

MacKeeper is crap, and should be avoided. Uninstall it. You can read about such apps in  http://thesafemac.com.

Forget the post of Kitkat: nonsense.

But I think your issue is already gone after running AdwareMedic, as everybody here suggested.

Lex

Adwaremedic is now called Malwarebytes Anti Malware and it did the trick! Thank you.