You might be one of the lucky ones, who's CD burner supports the larger capacity CD-R's.
You can check out this site to see if yours does:-
It's not the most upto date site, and you will have to scroll down the page a bit until you get to the drive list. But you might be lucky..........
You could just take a chance and buy (or borrow) 90min or 99min CD-R media.
However, before you start burning, load your blank CD-R into your CD burner and use Nero's InfoTool (v1.03.3), If you select the correct options you will be see if you CD burner supports larger capacity CD-R's.
I have obtianed good results using 99min CD-R's from 'Infiniti' (available from mediainternational.com).
Infact, as recently as yesterday I burned a 744MB DivX file onto this media, using Nero (v126.96.36.199).
Curiously, while using Nero's 'wizard' option, I forgot about setting up the software for over burning. I thought I was going to end up with another fancy beer matt, but the disc burned fine............ maybe somebody could explain this one?