STOP 0x0000003F    |    Fix Error Code 0x0000003F    |    NO_MORE_SYSTEM_PTES


STOP Errors are usually the result of a hardware malfunction or device driver issue. It is also possible to receive a Blue Screen Error due to bad system memory, malfunctioning power supply, components overheating, or hardware overclocked beyond its specification. In older versions of the Windows OS you may also receive Blue Screen Errors due to incompatible DLL files.

Since the only option when receiving a Blue Screen Error is to reboot, any unsaved data is lost. With that in mind, it is very important to eliminate these errors to protect your data.

Basic Troubleshooting

Troubleshooting STOP Errors can be a difficult and time consuming process. Try these basic steps to fix your own Blue Scree Error. We hope it will help you avoid an expensive service call and provide a rewarding experience of solving the problem on your own.

Advanced Troubleshooting

The following details are for advanced users. These are provided for your convenience and may help those with advanced knowledge discover the root cause of their STOP Error.


The NO_MORE_SYSTEM_PTES stop error code has a value of 0x0000003F. This is the result of a system which has performed too many I/O actions. This has resulted in fragmented system page table entries (PTE).


The following parameters are displayed on the blue screen.

10: system expansion PTE type

1: nonpaged pool expansion PTE type

2Size of memory request
3Total free system PTEs
4Total system PTEs


In almost all cases, the system is not actually out of PTEs. Rather, a driver has requested a large block of memory, but there is no contiguous block of sufficient size to satisfy this request.

Often video drivers will allocate large amounts of kernel memory that must succeed. Some backup programs do the same.

Resolving the Problem

A possible work-around: Modify the registry to increase the total number of system PTEs. If this does not help, remove any recently-installed software, especially backup utilities or disk-intensive applications.

Debugging the problem: The following method can be used to debug stop error code 0x3F.

First, get a stack trace, and use the !sysptes 3 extension command.

Then set HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\TrackPtes equal to DWORD 1, and reboot. This will cause the system to save stack traces.

This allows you to display more detailed information about the PTE owners. For example:

0: kd> !sysptes 4

0x2c47 System PTEs allocated to mapping locked pages

VA       MDL     PageCount  Caller/CallersCaller
f0e5db48 eb6ceef0        1 ntkrpamp!MmMapLockedPages+0x15/ntkrpamp!IopfCallDriver+0x35
f0c3fe48 eb634bf0        1 netbt!NbtTdiAssociateConnection+0x1f/netbt!DelayedNbtProcessConnect+0x17c
f0db38e8 eb65b880        1 mrxsmb!SmbMmAllocateSessionEntry+0x89/mrxsmb!SmbCepInitializeExchange+0xda
f8312568 eb6df880        1 rdbss!RxCreateFromNetRoot+0x3d7/rdbss!RxCreateFromNetRoot+0x93
f8363908 eb685880        1 mrxsmb!SmbMmAllocateSessionEntry+0x89/mrxsmb!SmbCepInitializeExchange+0xda
f0c54248 eb640880        1 rdbss!RxCreateFromNetRoot+0x3d7/rdbss!RxCreateFromNetRoot+0x93
f0ddf448 eb5f3160        1 mrxsmb!MrxSmbUnalignedDirEntryCopyTail+0x387/mrxsmb!MRxSmbCoreInformation+0x36
f150bc08 eb6367b0        1 mrxsmb!MrxSmbUnalignedDirEntryCopyTail+0x387/mrxsmb!MRxSmbCoreInformation+0x36
f1392308 eb6fba70        1 netbt!NbtTdiOpenAddress+0x1fb/netbt!DelayedNbtProcessConnect+0x17c
eb1bee64 edac5000      200 VIDEOPRT!pVideoPortGetDeviceBase+0x118/VIDEOPRT!VideoPortMapMemory+0x45
f139b5a8 edd4b000       12 rdbss!FsRtlCopyWrite2+0x34/rdbss!RxDriverEntry+0x149
eb41f400 ede92000       20 VIDEOPRT!pVideoPortGetDeviceBase+0x139/VIDEOPRT!VideoPortGetDeviceBase+0x1b
eb41f198 edf2a000       20 NDIS!NdisReadNetworkAddress+0x3a/NDIS!NdisFreeSharedMemory+0x58
eb41f1e4 eb110000       10 VIDEOPRT!pVideoPortGetDeviceBase+0x139/VIDEOPRT!VideoPortGetDeviceBase+0x1b

If the system runs out of PTEs again after the TrackPtes registry value has been set, stop error code 0xD8 (DRIVER_USED_EXCESSIVE_PTES) will be issued instead of 0x3F. The name of the driver causing this error will be displayed as well.

Helpful Tools

The following products are free to try. We have found them to be of the highest quality and value. They have been extremely useful in our own pc troubleshooting and maintainance and we highly recommend trying them out for yourself.

Anti-Malware Pro

With a lightning fast free scan and the largest authentic spyware detection database we have seen, Anti-Malware Pro finds and removes threats to your PC stability and security. Download Anti-Malware Pro


DriverFinder will scan your system for driver and software updates. Its easy to use interface makes keeping your drivers updated quick and simple. They will even send you an email notification when new driver updates are available for your system! It doesn't get any more convenient than this. Download DriverFinder

Browse STOP Error Codes:

Is a STOP error code missing?

Help us to make the best resource we possibly can by submitting you very own STOP error code details. If you have detailed information on any STOP error code please let us know by visiting the following link.

Submit Error Details Form

STOP 0x0000003F    |    Fix Windows Registry Errors    |    Repair Windows Error 0x0000003F