Jackie..
Tell your IT tech that the data is not gone. There are 2 things he can do.
1st. When you are on the Desktop that you can't click on anything tell him to hit Ctrl-Alt-Delete and hold the shift key and Click on the reset menu item. The computer will reboot and open with some different block choices. Click on Reset your PC and alot of the times it will ask if you want to keep your data. Tell him to answer yes. After about a half hour your computer should restart with windows 10 reinstalled and your files in tact. You will need to reinstall your programs again.
- If the first one does not work have him remove your hard drive from the computer. Your data is still all in tact its the system profile that is trashed. Copy your users folder which contains your documents and other files. After he does that put the hard drive back in the computer and then re-install windows 10 your files will be safe and you will have a copy of them.. After he returns the computer to you sign up for OneDrive and use this to back up your important files regularly.
I have done the above o 10 laptops this week and all have worked correctly after complete and all files intact.
Rick