Your Friend and Mine The Windows Registry. What is the Registry? ► Think of as a giant 411 switchboard ► Simple idea of centralized one-stop shopping.

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Presentation transcript:

Your Friend and Mine The Windows Registry

What is the Registry? ► Think of as a giant 411 switchboard ► Simple idea of centralized one-stop shopping for all of Windows’ needs ► Everything else is a GUI for it:  Windows Control Panel  File Associations  Startup Folder ► Information about WHAT and WHERE things are but not specifics on HOW to run them

Why Edit the Registry? ► Registry is the ULTIMATE authority ► Editing it directly allows greater control over what windows does ► Allows control over some features that don’t have a GUI ► When things go bad…

Editing the Registry: The Choice is Simple ► Regedit.exe  Designed for single user registries.  Cleaner interface  Available in all supported versions of Windows ► Regedt32.exe  Designed primarily for networked registries  Available in Windows 2000, and NT  Merged with regedit.exe in Windows XP

Registry Basics ► Keys and Subkeys(Folders) ► Reg_Dword (Numbers)  Hexadecimal (decimal) ► 0x (1)  True =1 False =0 ► Reg_SZ (String)  Stores strings (paths to files, etc.)  Can be encrypted

Backup First!! ► The registry stores everything that windows knows about the computer…let that sink in. ► Backup first! ► File =>Export or File =>Backup ► “Scanreg /backup” and System Restore ► MISTAKE=FORMAT!

Organization of the Registry Registry (Hkey) Local Machine Current User Users Classes Root Current Config

The forgotten one- HKey_Current_Config\ ► Stores temporary information about computer’s settings ► Barely implemented ► \Microsoft\Windows\CurrentVersion\InternetSettings (proxy enable)

The User Database ► Personalized Settings for Windows  Themes  Accessibility  Preferences ► The Cycle- DB ► Saved on Exit ► Edit only Current_User All Users (2k/Me/XP) Current User HKey_Users

Important Stuff in HKCU ► AppEvents= Themes (Event Sounds) ► ControlPanel = duh! ► Screen Saver ► Desktop ► Software=User Preferences ► \Microsoft\Office\x.y\ (office prefs) ► These keys are usually system safe to delete

Important Stuff in HKCU ► AppEvents= Themes (Event Sounds) ► ControlPanel = duh! ► Screen Saver ► Desktop ► Software=User Preferences ► \Microsoft\Office\x.y\ (office prefs) ► These keys are usually system safe to delete

Hkey_Classes_Root: What should I do with that? ► Handles file extensions/ associations and links to methods ► Choose what opens with what (remove old apps)  Who wins with multiple apps .mp3 => MMJB.mp3 and mp3file ►.EXE’s + Viruses.mp3 (Default) MMJB.mp3 Icon Command ContentTypeOpenWithList IconCommand

Hkey_Classes_Root: What should I do with that? ► Handles file extensions/ associations and links to methods ► Choose what opens with what (remove old apps)  Who wins with multiple apps .mp3 => MMJB.mp3 and mp3file ►.EXE’s + Viruses.mp3 (Default) MMJB.mp3 Icon Command ContentTypeOpenWithList IconCommand

Hkey_Classes_Root: What should I do with that? ► Handles file extensions/ associations and links to methods ► Choose what opens with what (remove old apps)  Who wins with multiple apps .mp3 => MMJB.mp3 and mp3file ►.EXE’s + Viruses.mp3 (Default) MMJB.mp3 Icon Command ContentTypeOpenWithList IconCommand

Hkey_Local_Machine HKey_Local_Machine Software \Microsoft\WindowsApplications System Control Sets/HW Profiles Hardware ► Software- Application Settinsg ► System- Control Sets  Control Sets = Windows HW Profiles ► Otherwise leave it alone!

Hkey_Local_Machine HKey_Local_Machine Software \Microsoft\WindowsApplications System Control Sets/HW Profiles Hardware ► Software- Application Settings ► System- Control Sets  Control Sets = Windows HW Profiles ► Otherwise leave it alone!

\CurrentControlSet ► \Enum\ – same as Device Mgr ► \Control\Class- Driver Database ► HKLM\System\CurrentControlSet\Services  This is the source of a lot of errors ► \Services\VxD  Those pesky VxD’s are stored here

\Software\Microsoft\Windows\Current Version ► /AppPath – points to registered apps ► /Run/ vs /Run-/ ► /Setup/  Change install path  Finding CD keys (shhh!)

Registry Tricks ► Backup first! ► If you can’t find it – Search! ► Copy to regedit.com if you’re infected by virus. ► for more info