Windows 10 free upgrade

Has anyone here upgraded to Windows 10? My PC keeps reminding me to upgrade for free. PC experts, will I lose all my files if I upgrade? Cheers in advance.
Adelaide 17/11/2009, Melbourne 20/11/2009, Sydney 22/11/2009, Melbourne (Big Day Out Festival) 24/01/2014
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- Christopher McCandless
My audio CD plays on other programs, so I know there's nothing wrong with the CD ROM drive.
I couldn't use my touchpad when I upgraded. Turned out to be a driver issue, needed to install/update drivers for the stupid touchpad. Someone else had another driver issue too. I seem to think that Win10 has issues with updating drivers.
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I've upgraded to Windows 10. Not a fan of the Windows boxes so I use Classic Shell. http://www.classicshell.net/
When I click start I get a 'critical error' pop up saying next time I sign in Windows will try to fix the problem however it never does when I sign in. I've tried restarting and some guides online like booting in safe mode and doing some command in command prompt.
I can't even open Microsoft Edge, calculator app and bring up options by right clicking on the folder on the task bar.
This is pissing me off big time. I wish I stuck with Windows 7, my PC has been playing up ever since I upgraded for free.
Anyone have these same issues? How did you fix?
Should I reformat and reinstall Windows 7?
Should I fk Windows off altogether and get an Apple laptop?