V325 and V323 are only compatible with the usbser.sys from Windows XP. Which is fine, except that (in most circumstances) they share a USB PID with the V710 and V265 -- phones which are only compatible with the usbser.sys from Windows 2000. (sucks, huh?)
Here's what I would do:
0) Unplug your phone.
1) Download and run the DriverTool:
http://www.bvrp.com/Customers/Motorola/DriverTool.zip
2) The original copies of the INF files will be placed in your NT user profile directory, along with the driver log which will tell you the file names of the OEM*.INF precopied versions that are in C:\WINNT or WINDOWS\INF.
3) Open the driver log (C:\Documents and Settings\your user\Motorola_Driver_Log.txt) and find the three OEM*.INF and *.PNF files that were copied to C:\WINDOWS\INF (this is denoted at the end of the log) and then head to C:\WINDOWS\INF and delete them.
4) Similarly, delete any INF/PNF backups that might exist in your NT user profile directory (starting with 10xxxxxxx.INF/PNF).
5) Then open USBMOT2000.INF. Find the line for USB PID 0x22B8 / 0x2A22, and remove it.
6) Go into USBMOT2000XP.INF, and add a few lines for 0x2A22. Like this:
;
V325 / V323 product ID
%USBMOTMODEM% = USBMOTOXP, USB\VID_22B8&PID_2A22
7) Plug in your phone. When it asks for drivers, point it at your profile directory.
8) After everything is finished, Device Manager should report that Motorola USB Modem is now using "usbsermptxp.sys", and you should be all set.
Now, remember: if you have a V710, V265, A840, etc. also, they're not going to work any more! If you want them to start working again, run DriverTool again.
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