User's Manual

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programs are uninstalled, these entries are often not deleted.
File Types
Entries in this area of the registry link one or more file extensions (e.g. .txt or .
doc) with various information (such as the program that should be used to open
them). Such entries can become invalid through the uninstallation of programs,
for example.
Database Drivers
During installation, some programs store entries on database drivers and data
sources in the registry. These entries can become invalid through the
uninstallation of these programs or the moving or deletion of individual data
sources. Often, invalid entries are created during installation itself.
Common Files
This part of the registry contains references to files and program libraries
(DLLs), to which several programs normally require access. When such
programs are uninstalled, these entries are often not deleted.
Help Files
Many programs record in the registry the location of their help files. When such
programs are uninstalled, these entries are often not deleted.
Installed Programs
Every program leaves behind an entry in this area of the registry. The list of all
programs in the Control Panel is compiled from these entries. When programs
are uninstalled, these entries are often not deleted and inconsistencies arise in
this list.
Program Settings
Each program installed on the computer can create entries with program-
specific information in the registry (e.g. data or program paths). When
programs are uninstalled, these entries are often not deleted.
Program Extensions
This area of the registry contains references to extensions such as audio and
video codecs or Internet Explorer add-ons that enhance the functionality of
individual programs (e.g. with new menu entries or new toolbar entries). If these
programs or extensions are uninstalled, these entries are often not deleted.
Program Components
Many Windows programs access ActiveX and COM components using entries
in this area of the registry. These entries are created when programs like this
are installed, but are often not deleted during uninstallation. Some programs
even create invalid entries during installation.
Program Paths
The installation folders of some programs are stored in the registry to allow
these programs to be run directly via "Start -> Run". When such programs are
uninstalled, these entries are often not deleted.
Fonts
Windows stores entries in this area of the registry for all fonts installed on your
computer. Since these entries are often not deleted when fonts are uninstalled,
Windows tries in vain to load these fonts every time the system starts up.
History Lists
Windows and many programs have history lists, which log, for example, which
files you were last working on. These are stored in the registry as references.
By deleting or moving the files, these entries become invalid.