MS Office Trial re-install

Ok, after a DISASTROUS upgrade from Vista to 7 which resulted in me having to format my laptop, my unactivated Office trial has (obviously) disappeared.  I found the disk which came with the laptop which says "Microsoft Works 9.0" and "Microsoft Office Home & Student 2007 Trial" on it assuming that it would have the trial on it to reinstall. But when I've tried, the disk only seems to have Microsoft Works on it.  I've tried the MS website, but they don't seem to offer a downloadable trial for Home & Student.

Can anyone help? Where can I reinstall the trial from? Should it have been on the disk that I have here?

Thanks for any help.