MS Office 2007

You can create recovery discs depending on the make of your computer. Most of the computers (for example: HP) which comes preloaded software have got recovery manager software. You can use that software to make initial recovery point and then discs.

Also, computers have got recovery partition which does the same thing. The only problem with recovery partition is no recovery if Hard Drive crashed. So recovery discs can really help in that case.

Cheers !

Go here http://www.microsoft.com/office/backup/en-us/default.mspx

Fill in the infomation and as long as you still have a valid CD key for Office 07 you will be varified and can download an ISO of it, or you can submit an order for a hard copy.

That the preloaded version of MS Office 2007 is not the usual trial version?
Common practise by system builders now is to load a 60 day trial od Office which actually last for 25 uses and not 60 days. If this is what you have you will be prompted to input a product key each time you use it until you actually do input one.
It is also normal not to receive the installation disk if the product was pre-loaded, this is an effort by Microsoft to avoid software piracy, you can get the disk if you pay for it from Microsoft.
So the answer to your question is no you cannot burn an installation cd from the files installed on your computer.
Also I am curious to know why you purchased a Vista CD? you already had a license for it!