I currently run Windows 7 and have Ubuntu 13.04 saved on my PC as a .iso file, I think it failed to download, but it wouldn't run in oracle Virtual Box, does this type of file work well in the virtual pc? I'm re-downloading 12.04 instead but my internet is very slow and the download is seeming endless for me, so hopefully it works
Yes, Virtual box is an excellent way of trying out Operating systems and can work with .iso files.
First step is to create your virtual machine setting up its RAM, Hard disk size etc.
Now you can mount the .iso image as a CD/DVD
Start the virtual machine and you can install the OS of choice. Do not forget to remove the .iso file from the virtual drive when you have finished.
Virtual Box has a facility called "Guest Editions". If the the guest OS you are using is Ubuntu I would recommend you do not install Guest Editions from the devices menu. It works but the version in the Ubuntu repositories has always worked better for me.
You can install this on your virtual machine by opening a terminal by pressing CTRL+ALT+T inside your virtual machine and typing