open software download - virus ??

1) My browser keeps getting hijacked, and 2) I am asked via a pop-up to go to https://opensoftwaredownload.com and install the program.

I have already 1) run avast antivirus 2) run malwarebytes anti-malware 3) checked my Chrome extensions and 4) and run add/remove programs and I cannot find where this program is hidden/located on my laptop.

Any advice on how to get rid of it?

Thank you