The Stop 0x50 message indicates that requested data was not in memory. The system generates an exception error when using a reference to an invalid system memory address. Defective memory (including main memory, L2 cache memory, and video RAM) or incompatible software (including remote control and antivirus software) might cause Stop 0x50 messages.

Interpreting the Stop 0x50 Message

Parameter Description
Parameter 1 Memory address referenced.
Parameter 2 • Type of access:
• 0x00000000 = read operation
• 0x00000001 = write operation
Parameter 3 If not zero, the instruction address that referenced the address in Parameter 1.
Parameter 4 This parameter is reserved (set aside for future use).

Troubleshooting the Stop 0x50 Error

The following sections list the most common sources for this Stop error and suggest some troubleshooting solutions.

New hardware issues
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.

Driver and system service issues
Stop 0x50 messages can also occur after you install faulty drivers or system services. If the file listed is a driver, use Driver Verifier to validate that the reported driver is causing the problem. Once you have identified the problematic driver, use Device Manager to roll back or update the driver to correct the problem. If the device is not critical to the functionality of the system (for example, the keyboard driver), you can also uninstall or disable the driver.

If you have recently added a service or application, 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 adapters, video adapters, backup programs, multimedia applications, antivirus scanners, and CD/DVD 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 1100B might temporarily resolve the problem.