Vista will not fully load to log in screen Canon Multi Function mp390 seems to be the problem

> Hi all, wonder if anyone can offer me some suggestions.
> For the past 2 weeks, every time I've had to reboot Vista, it would hang
> just before the log in screen.
> My Dell pc diagnostic lights one front of box were showing 1 and 2 for
> longer than normal during bios startup.
> after 30 seconds or so, they went off and Vista tried to load, but very
> slow
> So I tried changing ram cards, as lights 1 and 2 of Dell system relates to
> memory issue
> Luckily I had some ram spare from when I upgraded the ram.
> This made no difference to problem.
>
> I by fluke noticed that if I only had monitor plugged in, power lead and
> USB cable for wireless keyboard combo connected, Vista started up fine and
> quick.
> So I did a process of elimination by connecting USB cables one at a time
> for each boot up, all went okay until I connected the USB cable for the
> Canon Multi Function MP390, vista would not fully load and I got know
> error messages.
> I have installed the Vista Drivers for this device. It does work, but I
> have noticed even under XP, that PC lost connection to it and I had to
> unplug power on printer and plug it in again for PC to find it.
>
> Anyway had anything similar?
> Would it be the cable or the printer itself?
>
> I'm going to search and see if Canon has a Driver for that printer for
> 64bit version of Vista
>
> I know they released some new drivers for vista last week, but only 32bit
> ones.
>
> Thanks in advance
>
> Phil
>
>