E-Machines W3107 (RBW3107) PC Desktop "emachine 642" Questions

Emachine w3503 system restore lost verification code for office After I did a total system restore after moving due to crash of system I lost the code for office 2003 that was originally installed on ...

...emachine from a friend that erased everything and windows needs to be activated. I used the product key on the back of the machine and it states that it is invalid. How do I activate windows if I ...