Windows 10: If i change my operational system and then try to change back. Will i lost all my files

So i am thinking about switching to linus to try it out.But could i switch back to windows 10 and have all my original files on it?

:)

 

operating system language problem

I have upgraded my windows 8.1 to windows 10 in August 2015. Since then I am struggling to change the operating system language but not able to do it as I cannot understand Dutch in which the system got upgraded. I bought this lenovo laptop from Netherlands,
so it has default operating system language as dutch. I tried many tips suggested online to change it but not able to change it. Please suggest how can I get rid of these problem. I want to have administrative language as English. Please suggest step by step
procedure. It is even difficult to figure out which is pc setting option, recovery option or update option in dutch.

Thank you.

 

How to change File type on Windows 10 - File Extension Change

Windows 10 my jpegs. open with paint. Is that normal? It was a photo and opened in paint. I want to see the page of all the file extensions to see what they are opening. Somehow my friend has changed her DIP program to opening with pngs and thy won't open at all. she needs to change them back to what they were. I have looked online anf found nothing that helps...too complicated. Could I please get a step by step 1, 2, 3 etc list to help her change her program extension to the right one. Please and thank you.

 

' choose an operation system to start"

Hi Bob,

To better assist you, do let us the complete message that you receive.

Sometimes, this could be due to two operating system installed in your computer. Just to make sure this is not the case, I suggest you to try the steps below:

1. Press Windows key + R.

2. Type msconfig and press enter.

3. Click the "boot" tab and check if there are any other operating system listed.

4. In addition, change the timeout time to 3 seconds(default)

Let us know the result, we will be glad to help if you need further assistance.