Updated Three people in Illinois have filed a lawsuit against Microsoft, claiming that its Windows 10 update destroyed their data and damaged their computers. The complaint [PDF], filed in Chicago's US District Court on Thursday, charges that Microsoft Windows 10 is a defective product and that its maker failed to provide adequate warning about the potential risks posed by Windows 10 installation – specifically system stability and data loss. Microsoft "failed to exercise reasonable care in designing, formulating, and manufacturing the Windows 10 upgrade and placing it into the stream of commerce," the complaint claims. "As a result of its failure to exercise reasonable care, [the company] distributed an operating system that was liable to cause loss of data or damage to hardware Read More This is unfortunate for people who loss their data, and had their computers destroyed by Windows 10 failed upgrade. Hopefully, the users backed up their data before upgrading to Windows 10, or at least printed out important data like their homework like English essays to paper. Small 500GB USB hard drives for $60, so users should be able to afford to backup most of their important data to another drive, or buy 50 DVD-R 4.7GB disc for $20 to create many backup DVD disc of their data.