Since you cant get onone software to work you might need to resort to the EOS software.
Someone demoing a 30d using that for intervals in this youtube link. That software is a nightmare to get working if you don't have the CD but if you have the software then I would say that is your best bet.
I use One1 DSLR Camera Remote for exactly this.
It hooks your camera (in my case a Canon 40d) via the USB to my laptop, I've used it on a Dell and on my Macbook Air. In the case of my Air, I also bought the DSLR Remote software app for my iphone and over wifi could monitor the images on my phone.
You can also alter settings and trigger the shutter from your phone, eg. if you are in manual mode, you can change aperture and shutter speeds.