Assertion 'Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA' failed at ntoskrnl/mm/mdlsup.c line 327

fixme:(dll/win32/user32/misc/desktop.c:133) FIXME: Unsupported SPI Code: 42
(dll/ntdll/ldr/utils.c:2029) Failed to create or open dll section of 'C:\Documents and Settings\Administrator\Application Data\Mozilla\Firefox\Profiles\q3a7dx6n.default/nssckbi.dll' (Status c0000135)
MSAFD: Error c0000001 is unknown
Assertion 'Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA' failed at ntoskrnl/mm/mdlsup.c line 327
Entered debugger on embedded INT3 at 0x0008:0x808a8662.
kdb:> bt
Eip:
<NTOSKRNL.EXE:a8663 (lib/rtl/i386/debug_asm.S:33 (DbgBreakPoint@0))>
Frames:
<NTOSKRNL.EXE:6d1bf (ntoskrnl/mm/mdlsup.c:327 (MmUnmapLockedPages@8))>
<afd.sys:3afb (drivers/network/afd/afd/lock.c:57 (UnlockRequest))>
<afd.sys:3bc1 (drivers/network/afd/afd/lock.c:276 (UnlockAndMaybeComplete@20))>
<afd.sys:a6c8 (drivers/network/afd/afd/write.c:380 (AfdConnectedSocketWriteData@16))>
<afd.sys:4bf6 (drivers/network/afd/afd/main.c:371 (AfdDispatch@8))>
<NTOSKRNL.EXE:4ee43 (ntoskrnl/io/iomgr/irp.c:1138 (@IofCallDriver@8))>
<NTOSKRNL.EXE:49510 (ntoskrnl/io/iomgr/iofunc.c:137 (IopPerformSynchronousRequest@28))>
<NTOSKRNL.EXE:4a11c (ntoskrnl/io/iomgr/iofunc.c:506 (IopDeviceFsIoControl@44))>
<NTOSKRNL.EXE:4a371 (ntoskrnl/io/iomgr/iofunc.c:921 (NtDeviceIoControlFile@40))>
<NTOSKRNL.EXE:a072a (ntoskrnl/ke/i386/trap.s:244 (KiFastCallEntry))>
<ntdll.dll:5bfa>
<ws2_32.dll:55b5>
<ws2_32.dll:56a2>
<nspr4.dll:18c85>
Couldn't access memory at 0x00000003!
kdb:>

During browsing with Firefox 1.5 on ReactOS 0.4-SVN (Build 20080821-r35501)