In theory, Windows Seven has the possibility to burn ISO images (right click the ISO file). Using Windows 7, the problem could arise from the fact that there is no "burning speed" setting.
where you have the download links, you also have:
The easiest way to burn the ISO file to CD is to use a small specialized freeware such as BurnCDCC or Active@ ISO Burner. For further assistance, refer to the tutorials section for help with burning the ISO image to CD with various popular CD recording software. Where possible, experiment with CDRW discs instead of CDR discs so that you can start over if something goes wrong, instead of churning out coasters.
There you also have the links to ISO burning software, in case you don't have already a burning tool able to burn ISO images.
If you don't have burning tools already installed, then click at the links to the tools mentioned in that quoted paragraph, and look for the screenshots.
You will find several useful settings, including the "burning speed" (shouldn't be faster than 4x or 8x, according to your burner and your optical media). Whichever tool (there are too many to mention here) seems adequate for you, then download it and use it for ISO image burning (again, if you are sure you don't have already a burning tool installed).
Just note that whichever burning tool you use, "data" burning is not the same as "ISO image burning".
For UBCD, a CD-RW or CD+RW are the ideal optical media.