Upgrading from Vista to Windows 8

I ran the programme to see if this PC is okay to upgrade but I dont really understand the few that aren't compatible

Realtek Ethernet Network Card Diagnostic Tool
Secure Boot
Microsoft Office Word viewer 2003
Screen Resolution doesn't meet the requirement to install apps from the window store ( needs to be 1024X768)
Sidebar gadgets aren't supported in windows 8
Install an app to play DVDs

Can anybody tell me if I need all of these or can I install them

Thanks

Upgrading from Vista to Windows 8