The System hive memory limitation is improved in Windows Server 2003
Registry Size Limit functionality has been removed from Windows Server 2003 and from Windows XP
Registry Size Limit Change Results in PagedPoolSize Change

Inside the Registry - By Mark Russinovich

Why your registry doesn’t need cleaning
Boneman's Blog - Active Setup Registry Keys and their Purpose In het kort: worden gekopieerd van HKLM naar HKCU wanneer zij daar ontbreken. Zie ook Wiki Desktop - Active Setup
Windows Server Hacks: Customizing Windows' Just-in-Time Setup rename StubPath key naar HideStubPath onder subkey van HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components om active setup van dat onderdeel te voorkomen.
Robert McMurray's Blog [MSFT] - WebDAV Redirector Registry Settings

ERUNT en NTREGOPT

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Map Network Drive MRU

Bron:How to Clear Map Network Drive’s Most Recently Used(MRU) list in XP

Aan:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\SysTray]
"Services"=dword:0000001F

Uit:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\SysTray]
"Services"=dword:0000001B

Bron:MSFN - Applets\Systray\Services, Definition of bits in key

Voor alle accounts op de machine:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers]
"C:\\Program Files\\AppDir\\app.exe"="WINXPSP2"

Voor de huidige account:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers]
"C:\\Program Files\\AppDir\\app.exe"="WINXPSP2"

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Mr. Enigma

“After some internal research, Microsoft found the source. Despite the enigmatic name, the entry is harmless. It apparently relates to “a workaround for supporting region encoding for DVD RPC Phase 1 drives on Windows 95.” There's clearly no point in retaining this key in Windows XP, and in fact, Microsoft plans to remove it, possibly in an upcoming Service Pack. As for why the name Mr. Enigma, the company declined to share the joke, saying it was just “too stupid.” Goodbye, Mr. Enigma.”
Bron:PC Magazine - Who is Mr. Enigma