Hello there! If you think that Microsoft did a real bad job with the whole Modern UI and other UI changes, you might find these links helpful!
Disable Lock Screen
How to Disable Lock Screen in Windows 8? - Tweaking with Vishal
Disable SmartScreen
How to Disable SmartScreen Filter in Windows 8? - Tweaking with Vishal
Get the Start Menu/Orb back
[AIO] List of Free Software to Get Start Menu and Start Button Back in Windows 8 - Tweaking with Vishal
Enable the Delete Confirmation Prompt
How to Enable Delete Confirmation Dialog Box in Windows 8? - Tweaking with Vishal
Enable "Aero Lite" Theme (more similar to Windows 7-style transparent theme)
How to Enable Hidden ?Aero Lite? Theme in Windows 8 RTM? - Tweaking with Vishal
Disable hot corners, charms bar/hints, boot straight to desktop
Skip Metro Suite Settings: Freeware to Skip Start Screen and Disable Charms Bar and Other Hot Corners in Windows 8 - Tweaking with Vishal
Disable Metro/Modern UI style bootloader
How to Disable New Metro Boot Loader and Bring Back Windows Vista and 7 Style Boot Loader in Windows 8? - Tweaking with Vishal
Remove Ribbon from Windows Explorer
Yet Another Way to Remove Ribbon UI from Windows 8 Explorer without Breaking Paint and WordPad Apps - Tweaking with Vishal
Disable Lock Screen
How to Disable Lock Screen in Windows 8? - Tweaking with Vishal
Disable SmartScreen
How to Disable SmartScreen Filter in Windows 8? - Tweaking with Vishal
Get the Start Menu/Orb back
[AIO] List of Free Software to Get Start Menu and Start Button Back in Windows 8 - Tweaking with Vishal
Enable the Delete Confirmation Prompt
How to Enable Delete Confirmation Dialog Box in Windows 8? - Tweaking with Vishal
Enable "Aero Lite" Theme (more similar to Windows 7-style transparent theme)
How to Enable Hidden ?Aero Lite? Theme in Windows 8 RTM? - Tweaking with Vishal
Disable hot corners, charms bar/hints, boot straight to desktop
Skip Metro Suite Settings: Freeware to Skip Start Screen and Disable Charms Bar and Other Hot Corners in Windows 8 - Tweaking with Vishal
Disable Metro/Modern UI style bootloader
How to Disable New Metro Boot Loader and Bring Back Windows Vista and 7 Style Boot Loader in Windows 8? - Tweaking with Vishal
Remove Ribbon from Windows Explorer
Yet Another Way to Remove Ribbon UI from Windows 8 Explorer without Breaking Paint and WordPad Apps - Tweaking with Vishal