I know this is a common problem and I've have tried and tried to sort this without bothering you kind people. I've done about 50 searches and every thread relating to this issue ends with the solution to wipe one's computer back to a clean Win7/Win8 install. I'm in a tough spot where it will take me a very long time to wipe my PC. I would like to avoid it if possible. This is why I've been trying so hard to find a solution from a older thread but to no avail. I've tried WTK, KMSNano, KMSpico. Manual CMD Activation and KMS Activation Helper. Each time I get an error message along the lines of. "No Key Management Service (KMS) could be contacted" I believe my problem comes from the fact I moved from Office 2010 to Office Pro Plus 2013. This is the problem most people seem to share with me. But I don't understand why this issue should affect it. I've used all possible uinstallers such as REVO Uninstaller, CCleaner and Brute force going through regedit and picking through key values for Office15 etc. I just need any help available as the furthest I can get it activating. The programs work fine until I restart and then when I open Outlook for example. A Installer window pops up and asks me to restart. Telling me that my product key is invalid. I have a VL version of the suite and have tried disabling firewalls and antivirus. Any help much appreciated. I'm quite competent but the error codes don't shed much light on the problem.