You can filter traffic with CpmInventory.
Under desktop traffic you can buy Windows specifically that too with browsers required.
like, Windows with Chrome,
Windows traffic with firefox, IE & others.

Windows banners starting at just $0.50 CPM.
Windows Popunder traffic starting at $1 CPM only.
Prices varies with the countries.
Worldwide windows traffic available,  majorly US, followed by UK, DE, CA, AU, IN, FR, IT, etc.

For more details, email at  info@cpminventory.com
or Skype @ popundermedia