found this here
http://safari.oreilly.com/0596004168/winxpannoy-APP-E
No More System PTEs (stop code 0X0000003F)
Page Table Entries (PTEs) are used to map RAM as it is divided into page frames by the Virtual Memory Manager (VMM). This error usually means that Windows has run out of PTEs.
Aside from the usual assortment of faulty drivers and services that can cause all sorts of problems, this error can also occur if you're using multiple monitors.
If you find that you're experiencing this error often, you can increase Windows' allocation of PTEs with this procedure:
Open the Registry Editor (discussed in Chapter 3).
Expand the branches to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
Double-click the PagedPoolSize value, enter 0 for its value data, and click OK.
Next, double-click the SystemPages value. If you're using multiple monitors, enter a value of 36000 here. Otherwise, enter 40000 if you have 128MB of system RAM or less, or 110000 if you have more than 128MB of RAM.
Click OK and then close the Registry Editor when you're done. The change will take effect when you restart Windows.