Transfer office 2007 to disc from Hard drive

Hi All
I'm having a serious problem that I hope that someone out there will have the solution to. I need to extract my MS OFFICE ENTERPRISE 2007 off my current hard drive and burn it to disc, as I am upgrading my OS from XP PRO to Windows 7. I do not have the origional install discs and I cannot afford to get another copy. I have tried all sorts to do it but with no luck. Any help would be greatly appreciated .
Thanks Guys

You really need the COA (Certificate of Authenticy). If you have that, you can borrow a disk from someone. Otherwise, you may be able to download the trial version and use your COA.

Here's a link to the trial:

http://www2.buyoffice.microsoft.com/usa/default.aspx?country_id=US