I let my lap top update to Windows 10 (it kept bugging me constantly and I finally "gave in") and it completely lost my documents, pictures, my email, my Microsoft Excel and Word, etc. It left a few programs on there. I went to their help "on-line" and let them take control of my computer and even they could not find my documents, excel spreadsheets or pictures or any of that. I tried to do a "restore" - the W10 does not recognize the earlier program that has a restore point! They wanted me to do it again (I checked to "save files") and then I was left with a black screen and the Recycle "Trash Can" and nothing else. I am a Realtor so that would mean I lost all my contracts, photos on houses, visual tours, etc. So I was pretty upset. Took it to the hospital - they were able to put an earlier Windows on it (7 I believe) and tried to save my files. Cost me $125. I have found my excel files but have not found my Word files. I lost all my "favorites" and have had to slowly add them back - I was having to find my passwords and everything. It will be a slow re-build - I have had to reinstall programs such as Microsoft Office (Excel/Word/Picture Mgr), Visual Tour, Quickbooks, HP printer, Adobe Acrobat (for saving and emailing documents and contracts), my photo program, etc. My computer guy says my email program does not work with W10 so it is completely gone and so I have to figure something else out on an email program (for my business). I hate the "web mail" program that our server uses and I have not been able to restore Windows "Live Mail" that I was using. Seems to have some sort of glitch in it and will not let me load my email info for some odd reason. He says the data is there - I just have to find it and may not ever be able to. Probably have to reinstall hundreds of email addresses again as soon as I find a good program for that. I may have to go to "gmail" like so many others have! I recommend that no one update to Windows 10 unless they have everything backed up and ready to restore. You will lose most of your programs you have been using because they will not work with W10. You are probably BETTER OFF if you do NOT let your computer update - just later on get a new computer that has W10 on it. It has cost me $125 money wise, and hours on hours of my time - and will still cost me hours on hours.