aspire 5738 fails to upgrade to windows 10

I've upgraded all existing software, turned off the fireewall and all anti-virus programs, completely uninstalled and removed all Norton 360 remnants. Windows 10 update downloaded succesfully (?) the software from Microsoft. I've run the upgradee program at least a dozn times, and each time the mchine re-boots to the Aspire Windows 7. I removed about 100gb of files/data, have over 150 gb of free space on the hard drive, and it finally went thrugh process tht appeared to be updating to Windows 10. However, on the re-boot, it ended u going back to the pire Widows 7. I've run the upgrade at least a dozn more times, and it stil just immediatly re-boots back to Aspire Windows 7.