I've got a server running Windows Server 2003 (fully patched). Machine details: Dell PowerEdge 840 bios version: X16 BMC version: 1.75 OS: Microsoft Windows Server 2003 R2, Standard Edition Version 5.2 (Build 3790 : Service Pack 2) (x86) It’s got a modem attached (MT9234ZBA-USB Multimodem) for sending faxes. The modem has the latest drivers and firmware from the manufacturer. (For what it’s worth, I’ve got another server {running SBS 2003} with 2 of these modems that’s 100% bulletproof.) The server will BSOD at random intervals (as often 2-3 times daily, sometimes not for 3 weeks.) The server ran problem free for 2 months without the modem installed, so I’m fairly sure that’s the problem. The crashes seemed to be fixed by updating to all the newest drivers, but a crash last night proved that’s not true. The modem includes wdfcoinstaller.dll (which is windows\system32) in its list of drivers. Wdf01000.sys is in the windows\system32\drivers dir. Both files have the exact same version info {version 1.5.600.0 (vista_rtm.061101-2205)} but of course are very different sizes. BSOD details: STOP: 0x0000007E (0x0000005, 0xF7AFC4C4, 0xB75B9C00, 0xB75B98FC) Edf01000.sys - Address F7AFC4C4 base at F7ACF000, DateStamp 4549b23a Any assistance if figuring out the problem would be greatly appreciated.

Compare the file length of wdfcoinstaller.dll and Wdf01000.sys with the files from the original drivers cd. If the length of the files differ, I would suggest to use the driver from the original drivers cd and give it a try. Please send a reply, if you solved the problem !!!