How do i find my product key when the 1 on my computer is wrong

Find product key for Windows or Office...

You need to use a utility called a keyfinder. A good, free one you can use is called Magical Jelly Bean Keyfinder. MJB Keyfinder may incorrectly appear as a virus or trojan to some antivirus programs

Here's a link to download it: http://magicaljellybean.com/keyfinder/
Here's a link to a guide on how to use it: http://pcsupport.about.com/od/productkeysactivation/ss/mjbkeyfindersbs.htm

The Magical Jelly Bean Keyfinder program is a free utility that retrieves product keys from the registry. It also has the ability to find product keys for Microsoft Office programs, along with product keys from many other non-Microsoft programs.
Advantages include very small size, ease of use, no installation required, instant display of product keys and multiple product key saving options.
Finds Keys for Operating Systems: Microsoft Windows 7, Windows Vista, Windows Server 2008, Windows Server 2003, Windows XP, Windows 2000, Windows ME, Windows 98, and Windows 95.
Finds Keys for Other Software: Microsoft Office 2007, Office 2003, Office XP, and several non-Microsoft programs.