This post offers:
Priceless, an extension with advertising function.
This victim runs Windows 7, infected with Priceless.
To avoid future infections, you may need to learn:
How to Uninstall Priceless Application?
Has no way to remove Priceless?
"Again, if I were to visit an article or website via google using Internet explorer, random words are underlined and highlighted. If I put my cursor over it, a pop up expands. Also, random ads appear.
I looked into Tools>Add Ons> and I found Priceless.It is enabled and there is no way to disable it.
I also looked into the C:// and deleted the files for it."
Priceless, an extension with advertising function.
Priceless comes out as an extension, which is created to mess up browsers by planting pop-ups, ads, popping up adverting websites and dragging down the browsing speed. Your browse safely and correctly. You don't know how you acquired this nasty add-on. You don't deserve the nasty trouble but you may have done something wrong, like carelessly when browsing and downloading.