Please help me.....

Hi I have a Toshiba Satellite C655-S5512 laptop that originally had Windows 7. I've had it for a few years and never had any problems with it until recently after I downloaded the free upgrade to Windows 10. Now I very often either get a BSOD saying different things or it won't even boot Windows and I get a black screen that says something about not reading something and that I need a boot disk. I've run the system repair a few times but it rarely helps. I was hoping I could get some advice from here. Can someone please help me out? Thanks

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