The Motorola C550 driver is for a USB modem. Much like the Motorola C650 and the Motorola 350 it is a well known product which is still being used today by many. Ensure that you have the correct modem and not one of the other Motorola devices before you install this driver.
Much like everything on the internet always ensure that you scan all your files for viruses before you install it onto your computer. This website is no different. This is also known as the C550, Motorola Flash Interface, Motorola USB Device and the CanoScan N670U/N676U.
Note: There is no Windows 7 driver for this hardware. This was the last driver for this hardware as it is very old and was never updated again. What you could try is running the driver in compatibility mode.
1. Place the driver installation file on the Desktop.
2. Right Click the driver installation file and select Properties/Compatibility Tab.
3. Select Windows XP for compatibility mode.
4. Click Apply
5. Right Click the file and select the Run As Administrator option to install.