I know some will say what is the point, but I still use a DOS database that holds transactions going back to 1983. It has worked perfectly throughout this time, and I still use it. Once again I will argue that for simple recording of important financial data or accounting transactions, there has been no significant improvement since then. In 1983 the first DOS spreadsheet - Multiplan literally changed my life. Preparing a Trial Balance and Profit and Loss Account/Balance sheet was hard work on 6 pages of hand written A3 paper. Overnight the spreadsheet changed this, with constant display of the totals and automatic production of the Final Accounts once the Trial Balance agreed. I therefore wanted to try my database on Windows 10 and kept getting error about NTVDM component missing or not enabled> I checked and NTVDM was enabled by default on my computer. Other people were having problems with DOS Applications running on Windows 10 relating to a message about NTVDM. Reading through all the posts on the Microsoft Community there was a solution on the last page. In full a copy says: First: Programs and Features -> Turn Windows Features on or off -> Legacy Components -> Enable NTVDM Second: Open "Command prompt" Right click over title "Command prompt" and select "Properties" Select "Use legacy console (require relauch)", then "Accept" Close and re-open "Command prompt" to test. The second command worked for me after the essential Restart (I had no need of the first command as NTVDM was enabled by default on my PC. Everything seems perfect now on v 10074 thank to all the help I have had from others with far more knowledge than me. I have re-installed about 10 times to correct errors and get rid of any messages following a re-install.The only thing that gives me a clean start is KILLDISK first. I had to use Paragon Partition Manager and Wipe Disk to get rid of strange small partitions that probably related to earlier uses,Win 7 and 8.