I gave up and brought my lap top to my work and show our IT guy during the lunch time. He ran "ComboFix" and that solved everything. He connected it to LAN and downloaded Chrome without any problem. Now, Chrome works and I could use IE to download Revo Uninstaller without error message. My IT guys said he does not know what "ComboFix" did. But, it is working fine. It looks like the virus scan I ran took care of the issue and BuyNSave extension is gone. Thanks for checking back anyway.