I need a product key for office home and student 2007 trail

Assuming you're in the US, you can buy a licence key here: http://office.microsoft.com/en-us/products/FX101211561033.aspx
Unfortunately you can't just get a key online, that's called piracy.

Expert nerd. Just download from microsoft. You'll get the key emailed to you then delete the zipped file.

Can't not use microsoft office 2007

Seriously NapkinBob is a ******* moron.  Read the damn question - they want a TRIAL product key.  MS WILL give you a FREE trial product key for 60 days.  And manufacturers pre-install MS Office Home/Student that are used for the 60 day trial period.

The problem is that they don't put a sticker with the product key on the bottom or on the machine, the OEM is suspose to be given but often isn't have it may or may NOT be in the registry.

MS says to contact them through their tech support number on their website when you can't find the product key and if its pre-installed they tell you to contact the manufacturer, but when you do they refer you back to MS in a vicious cycle.

Try looking through MS support before you offer up ignorant & uneducated advice NapkinBob.  And getting a TRIAL product key online is not called piracy!