My windows 7 is not genuine but is activated. Is it safe to enable windows update?
 

I have Office 2007 Professional Product Key Home Premium on my Office Standard 2007 Activation right now. It was pre-loaded Office 2007 Professional Plus Keygen the machine. I'd like to upgrade it to Windows 7. I am also planning on buying a Mac. Will I be able to load the Windows 7 upgrade version on that also? Thanks in advance for your help.