Resolving the Problem
 
The following suggestions are specific to Stop 0x50 errors. For additional troubleshooting suggestions that apply to all Stop errors, see "Stop Message Checklist" later in this appendix.
 
    * If you added new hardware recently, remove and replace the hardware to determine if it is causing or contributing to the problem. Run diagnostics software supplied by the hardware manufacturer to determine if the component has failed.
    * Stop 0x50 messages can also occur after installing faulty drivers or system services. If the file name is listed, you need to disable, remove, or roll back that driver. If not, disable the recently installed service or application to determine if this resolves the error. If this does not resolve the problem, contact the hardware manufacturer for updates. Using updated drivers and software is especially important for network interface cards, video adapters, backup programs, multimedia applications, antivirus scanners, and CD mastering tools. If an updated driver is not available, attempt to use a driver from a similar device in the same family. For example, if printing to a Model 1100C printer causes Stop 0x50 errors, using a printer driver meant for a Model 1100A or Model 1000 might temporarily resolve the problem.

0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
(Click to consult the online Win XP Resource Kit article, or see Windows 2000 Professional Resource Kit, p. 1548.)
Requested data was not in memory. An invalid system memory address was referenced. [b]Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software [/b](including remote control and antivirus software) might cause this Stop message, as may other hardware problems (e.g., incorrect SCSI termination or a flawed PCI card). Use the General Troubleshooting of STOP Messages checklist above.
 
    * Possible Resolutions to STOP 0x0A, 0x01E, and 0x50 Errors {KB 183169} Win NT, Win 2000, Win XP
    * During setup {KB 171003} Win NT, Win 2000, Win XP
    * Partial List of Driver Error Codes That the Driver Verifier Tool Uses to Report Problems {KB 315252} Win XP
    * Easy CD Creator 5.0 Does Not Function In Windows XP {KB 310628} Win XP
    * STOP Error When You Start Windows After You Connect a Scanner {KB 310869} Win XP
    * Stop 0x1E in PROTCLS.SYS When You Undock a Toshiba Tecra 8100 {KB 284154} Win XP
    * STOP 0x4E, STOP 0x1A, STOP 0x50, and STOP 0xA Errors Occur When You Try to Start the Computer {KB 271955} Win NT 4.0 (corrupt physical RAM)
    * “STOP 0x00000050” Error Message in Stac97.sys After You Upgrade Your Panasonic Toughbook to Win XP Service Pack 1 {KB 329832} Win XP SP1