What is the name of this patience style 2 deck card game
Sounds like the game you are thinking of could be Spider Solitaire or a variant of it.

The game:


is a solo style Patience/Solitaire game
is played with two decks
consists of 10 columns
cards are stacked with like suited cards from K to Ace in order to remove them
Only Kings may be placed on empty spaces


You can find the how-to-play rules here:
Bicycle Cards: How to play Spider Solitaire

A common game may look like this at the start (Source Wikipedia):


Sidenote: If you want to give spider Solitaire a go, try searching for it from your start menu. Some versions of Windows have the game installed by default.