I believe these are the keys you need:
Enable RUN in Start:
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
NoRun REG_DWORD 0x00000000
Disable Peek:
HKCU\Software\Microsoft\Windows\DWM
EnableAeroPeek REG_DWORD 0x00000000
Change Power Button Action:
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Start_PowerButtonAction REG_DWORD 0x*
Untick 'Highlight Newly Installed Programs':
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Start_NotifyNewApps REG_DWORD 0
Never Combine Taskbar Buttons:
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
TaskbarGlomLevel REG_DWORD 00000002
Untick 'Hide Extensions for Known File Types:
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
HideFileExt REG_DWORD 0x00000000
*Options for Start_PowerButtonAction
:
- Switch User: 0x00000100
- Log Off: 0x00000001
- Lock: 0x00000200
- Restart: 0x00000004
- Sleep: 0x00000010
- Hibernate: 0x00000040
- Shutdown: 0x00000002
Please note, these are obtained from various sources that seem reliable. However, messing with your registry could do damage. That being said, back up your data before trying these. I am working on testing them myself, but it may take time. I have wanted to do this for a while, so you inspired me to finally get around to it.