Is it new? U must have printed instruction in the box. Model name would be nice to know. Printers and scanners install in the different ways. Do u have a combo?
If u run the Windows update after u connect the printer/scanner, it will find the drivers needed to run, if compatible. Check here if not sure http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx
Or go online and find the directions on the Canon website support.http://usa.canon.com/cusa/support