Please run F12 preboot diagnostics perhaps a RAM module or your HDD is failing: [URL]  If diagnostics pass you should clean install Windows 10 using your WIndows 7 OEM key see here for more details: [URL]  Should you wish to stick to Windows 7 see here: [URL]   
Hi Everyone I have a very severe issue due to which my Dell Inspiron Laptop is in  dead state since last one month. I bought this Laptop in 2010 from UK. Everything was ok until last month when first windows user login screen took extraordinary time to show up and then when I restarted my Laptop Windows refused to start giving me following  error From Dell Windows 7 Reinstallation DVD, which came with the Laptop, I made bootable USB (as my optical drive does not work) to reinstall windows but after "window is loading files" screen when I click on Reinstall windows link it stucks there like forever. It just shows message "Setup is Starting Windows". I have waited for 4 to 5 hours but it does not proceed further. Someone please tell me what could be the reason for this. Thank in Advance 
Windows 7 Re-installation on DELL Inspiron 1564 hangs at "Setup is Starting 
Windows"