whenever i am trying to logon to my bank website it diverts me to mackeeper or some other pop up websites

I assume you have adware. Follow the instructions on this web page in order to manually remove adware from your mac: https://support.apple.com/en-us/HT203987

You may also find adware removal guide on this page http://www.thesafemac.com/arg-identification/

If you do not want to remove adware manually use adware medic tool in order to scan and remove it: http://www.adwaremedic.com/

Download, open adwaremedic dmg file , and run it by clicking “Scan for Adware” button to remove adware.

Once done, quit AdwareMedic and restart your mac.

Install adblock for your browser: https://adblockplus.org/

I've never used mackeeper so don't have experience un-installing.

Found this:

http://www.macworld.com/article/2861435/how-to-uninstall-mackeeper-from-your-mac .html