according the the above picture, it seems that there are some
problem with:
1) printer's usb port
2) comp's usb port (the one which you connect to printer)
3) the comp's whole usb section (if you have other connected
devices working fine, then it's ok)
as mentioned that you've installed the printer driver "only by
chance", there could be a possibilty that the printer's driver is
not installed properly (but i still suspect the fault lies with the
usb ports as you only managed to install the drivers "by
chance")
since you've tried alot of methods, why not try your usb ports one
by one now and see if the error message appears when the specific
usb port is used. if you're very sure that your usb ports are
working, try it on other systems. if the same error message appears
on other systems, then bring it bac to canon again.
btw, you using so much ram? 2GB? 