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The first of these is usually no more than a minor annoyance. The second can be more vexatious, but it usually only arises with programs designed for an earlier generation of operating system. In this chapter, we ll survey the hoops and hurdles and everything else having to do with the addition, removal, updating, and management of applications in Windows Vista.
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The Group Policy Editor, discussed in Managing Startup Programs, later in this chapter, is not available in Windows Vista Home Basic or Windows Vista Home Premium. Everything else in this chapter applies equally to all editions.
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Adding, Removing, and Managing Programs
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Dealing with User Account Control (UAC)
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Occasional exceptions aside, the rule in Windows Vista is: To install a program, you need administrative credentials. Software installers the programs that install programs typically create files in system folders (subfolders of %ProgramFiles%) and keys in protected registry locations, and these are actions that require elevated privileges. Installing the program files and registry keys in protected locations protects your programs (hence, you) from tampering by malicious parties, but it means that you need to deal with User Account Control prompts to complete the process. If you install a program while running under an administrative account, a UAC prompt will request your consent for the actions the installer is about to undertake. If you install while running under a standard account, you will be asked to supply the name and password of an administrative user.
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For more information about User Account Control, see Preventing Unsafe Actions with User Account Control, in 10.
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Windows Vista employs installer detection technology to determine when you have launched an installation process. This technology enables the operating system to request credentials at the time the process is launched, rather than waiting until the installer actually attempts to write to a protected location. The system presumes that any process with a filename containing particular keywords (such as install, setup, or update) or any process whose data includes particular keywords or byte sequences, is going to need elevated privileges to complete its work, and so the UAC prompt appears as soon as the installer process begins. After you have satisfied the UAC mechanism, the process runs in the security context of TrustedInstaller, a system-generated account that has access to the appropriate secure locations.
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Dealing with User Account Control (UAC)
TROUBLESHOOTING
No UAC prompt appears, and the install fails
If installer-detection technology fails to detect your installer, and if your installer tries to write to a protected area (in le storage or the registry), your setup will fail typically with an error message like this:
To solve this problem, rst do whatever is necessary to back out of the failed installation (click OK, Exit, Cancel, or whatever else seems appropriate). Then try to nd the executable le for the installer. It will not be named Setup or Install (because if it were, it would not have evaded the detector), but it will be an .exe le. When you nd it, right-click it in Windows Explorer and choose Run As Administrator. Supply your administrative credentials, and let the installer run.
The same technology that detects an installation process also recognizes when you re about to update or remove a program. So you can expect to see UAC prompts for these activities as well. Rules have exceptions, of course. The following kinds of programs are not flagged by installer-detection technology:
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64-bit executables Programs that have a RequestedExecutionLevel embedded in their application manifests.
Moreover, it is possible, although uncommon, for a program to install itself in an unprotected, per-user location. For example, SyncToy 1.4 for Windows Vista, a PowerToy program available free at http://www.vista-io.com/0401, installs itself in %LocalAppData%\SyncToy, a location in the profile of the person installing the application. The setup program also avoids detection by installer-detection technology, making SyncToy a rare case a program that you can install without administrative credentials. (For an interesting description of the how, if not the why, of creating a per-user installer, see How Do I Build a Standard User Package, in the blog post at http://www.vista-io.com/0402.)
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