few things to check before upgrade to windows 8 on older machine
- Make sure your computer supports secure boot. You might be thinking that you won't fret about windows 8 secure boot on this old machine and simply install windows 8 without it. you might be wrong on this, as per my experience installing windows 8 on outdated BIOS causes various kind of problems
- uninstall antivirus and other incompatible softwares & hardware from your computer
- Scan for infections using Hitman Pro