Hello,
After a long try the Canon Scanner 4200F with Windows 7 64bit Professional is running.
I got it running in this way:
1. deldrvvst6424640ej.exe --> Remove Canon 4200F
Driver
2. Unplug USB cable from scanner
3. CanonScan Setup CD-ROM v1.04--> Install
Driver und Canon ScanGear CS
--> WinXP SP2 Compatibility Modus
4. Reboot
5. Install Canon 4200F Windows 7 64bit
driver --> 4200fvst648620a_64en.exe
6. PlugIn USB Scanners cable.
7. Scanner was running afterwards :-) :-) :-)
Important: Without CanonScan Setup CD-ROM v1.04, I wasn't able to get it running !!! --> It shows you an error about 32bit driver. Don't care about.