Note... just for future reference on drivers...
ALL of the driver directories for ALL devices supported by Win7 are copied from the installation DVD onto your hard drive at Win7 installation time. They live in:
C:\Windows\System32\DriverStore\FileRepository
Furthermore, if a "new hardware detected" wizard process is invoked because you plug in a new device, such as your ML-1750 printer, if the needed driver is available in the FileRepository, that's where they'll be picked up from.
On the other hand, if the driver for the new device is not found in the FileRepository, then Win7 connects up to the Microsoft updates catalog web site to see if a new/recent driver is available from there. If so, that proper ZIP file is downloaded and unpacked, into the same FileRepository parent folder. The newly downloaded and expanded driver folder(s) will now be there forever, just like happens with the "out of the box" driver folders copied from the Win7 installation DVD.
So... it is now known that for your ML-1750 printer the proper driver INF file is SSUDRV.INF. If you do a SEARCH right now for that SSUDRV.INF file (in your 64-bit Win7 environment in which your printer drivers have now been successfully installed), I'm sure you'll find it in C:\Windows\System32\DriverStore\FileRepository, in some folder that probably starts off with something like SSUDRV.INF_AMD64_neutral in its name. This is the direct result of Win7 downloading the proper driver package file from the Microsoft updates web site... as I have done.
In fact, now that I have downloaded the proper ZIP file, I can actually go through the "add printer" dialog and point to the expanded folder (from my ZIP file), where the SSUDRV.INF lives in the ZIP file expansion. Win7 will actually then copy the folder into FileRepository, for possible future reference.
In fact, this is EXACTLY what the "new hardware detected" wizard is doing under the covers... retrieving the proper driver ZIP file from the Microsoft updates web site for your device, unzipping it, and initiating the "add printer" dialog pointing to this expanded driver folder where the proper INF file lives.