"Flash Player Pro" virus or program

Hi,

am using Win8.1 on sony vaio.

My PC got infected with "Flash Player Pro" virus or program. (Reason : am not able to open google search. upon entering a search text and hit enter, I was prompted to install "flash player pro" virus. My browser is also hijacked whrn I tried to open sites.)

I uninstalled firefox,chrome, cleaned all browsers, rest to defaults.

Then, I installed NIS (Norton internet security) which I bought, licensed and even it cannot find after running several scans.

Can anyone help?