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Your computer experiences sporadic blue screens, lockups, or other strange behavior
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When your computer acts unpredictably, chances are good that a buggy device driver is at fault. If you re experiencing unexplained computer problems, a powerful troubleshooting tool called Driver Verifier Manager (Verifier.exe) is a terrific way to identify flawed device drivers. Instead of your computer locking up at a most inopportune time with a misleading Blue Screen of Death (BSOD), Driver Verifier stops your computer predictably at startup with a BSOD that accurately explains the true problem. Although this doesn t sound like a huge improvement (your system still won t work, after all), Driver Verifier Manager performs a critical troubleshooting step: identifying the problem. You can then correct the problem by removing or replacing the offending driver. (If you re satisfied that the driver really is okay despite Driver Verifier Manager s warning, you can turn off Driver Verifier for all drivers or for a specific driver. Any driver that Driver Verifier chokes on should be regarded with suspicion, but some legitimate drivers bend the rules without causing problems.) Driver Verifier works at startup to thoroughly exercise each driver. It performs many of the same tests that are run by WHQL as part of the certification and signing process, such as checking for the way the driver accesses memory. Beware: If Driver Verifier Manager finds a nonconforming driver even one that doesn t seem to be causing any problems it will prevent your system from starting. Use Driver Verifier only if you re having problems. In other words, if it ain t broke To begin working with Driver Verifier Manager, you must start it using credentials from an account in the Administrators group. Open a Command Prompt window using the Run As Administrator option, type veri at the command line, and press Enter. In the er Driver Verifier Manager dialog box, shown below, select Create Standard Settings. In the next dialog box, select the type of drivers you want to verify; unsigned drivers are a likely cause of problems, as are those created for an older version of Windows.
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When you click Next, you get a list of all currently installed drivers that match the conditions you specified. Note that the list might contain a mix of hardware drivers and some file-system filter drivers, such as those used by antivirus programs, CD burning software, and other low-level system utilities. At this point you have two choices:
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Go through the list and make a note of all drivers identified and then click Cancel. No changes are made to your system configuration; all you ve done is gather a list of suspicious drivers, which you can then try to remove or disable manually. Click Finish to complete the wizard and restart your computer. Don t choose this option unless you re prepared to deal with the consequences, as explained in the remainder of this sidebar.
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If your computer stops with a blue screen when you next log on, you ve identified a problem driver. The error message includes the name of the offending driver and an error code. For information about the error codes, see Microsoft Knowledge Base article 229903, Partial List of Possible Error Codes With Driver Verifier. (Although this article is specifically for Windows 2000, the information is valid for Windows XP and Windows Vista.) To resolve the problem, boot into Safe Mode (press F8 during startup) and disable or uninstall the problem driver. You ll then want to check with the device vendor to get a working driver that you can install. To disable Driver Verifier so that it no longer performs verification checks at startup, run Driver Verifier Manager again and select Delete Existing Settings in the initial dialog box. Alternatively, at a command prompt, type veri er /reset. (If you haven t yet solved the driver problem, of course, you ll be stopped at a BSOD, unable to disable Driver Verifier. In that case, boot into Safe Mode and then disable Driver Verifier.) You can configure Driver Verifier so that it checks only certain drivers. To do that, open Driver Verifier Manager, select Create Standard Settings, click Next, and select the last option, Select Driver Names From A List. This option lets you exempt a particular driver from Driver Verifier s scrutiny such as one that Driver Verifier flags but you are certain is not the cause of your problem.
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You can read more about Driver Verifier online in Knowledge Base article 244617, How to Use Driver Verifier to Troubleshoot Windows Drivers.
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