Microsoft is facing calls to pay compensation to Windows 10 users because of performance issues.

New research by consumer advice group Which? shows that more than half of those who downloaded it said it "adversely affected their PC", while 12 percent of users chose to go back to their previous version.

The operating system has been installed on more than 350 million devices since its launch in July 2015. However, its users have experienced problems including its failure to recognise some anti-virus software and web cameras.

Which? has now called on Microsoft to consider "honour consumers' rights," and pay compensation "where appropriate", with Alex Neil, Which? director of campaigns and policy saying: "We rely heavily on our computers to carry out daily activities so, when they stop working, it is frustrating and stressful. Many people are having issues with Windows 10 and we believe Microsoft should be doing more to fix the problem".

Responding to the research, a Microsoft spokesperson said: "The Windows 10 upgrade is a choice designed to help people take advantage of the most secure,and most productive Windows.

"Customers have distinct options. Should a customer need help with the upgrade experience, we have numerous options including free customer support".