NOW TV is now available on PCs, laptops and tablet devices that run the Windows 8.1 operating system.
This takes the number of devices that support the online TV streaming service - which offers access to premium Sky TV content - to 60 in total.
Consumers with Windows 8.1 devices can download the NOW TV app from the Windows Store, giving them the option of taking out an Entertainment Month Pass, Sky Movies Month Pass, or Sky Sports Day Pass or Week Pass.
Gidon Katz, Director of NOW TV, said: "We’re excited to launch on Windows 8.1, giving customers yet another platform to watch NOW TV this Christmas, whether that’s watching the latest Christmas movies like Disney’s 'Frozen', festive favourites like 'Elf' and 'Home Alone', or starting a new Box Set such as the complete series of 'Mad Men'.”
Customers can sign up for NOW TV passes on a flexible basis, with no monthly commitment.
The NOW TV Entertainment Month Pass costs £6.99 per month, offering access to channels including Sky 1, Sky Atlantic, Sky Living, Sky Arts, Discovery, MTV, Comedy Central, GOLD, Disney, FOX, Nickelodeon and Nick Jnr.
For £9.99 per month, consumers can sign up for a Sky Movies Month Pass, which offers live and on-demand access to over 1,000 films.
The latest titles to launch include 'The LEGO Movie', Disney’s 'Muppets Most Wanted' and Marvel’s 'Captain America: The Winter Soldier'.
With a Sky Sports Day Pass - which costs £6.99 - or a Sky Sports Week Pass - priced at £10.99 - consumers can enjoy a host of top sporting action, including live Barclays Premier League football, PDC darts and England cricket.
NOW TV is available to UK customers with a compatible web-enabled device and a fixed-line broadband or 3G/4G connection.