Download Windows 10 using media creation tool It will help you make a bootable DVD or USB https://www.microsoft.com/en-us/software-download/windows10 do a nice clean fresh install.

Use one of these keys... They only work with the original release of the Windows 10 .ISO

Windows 10 Professional - 			               W269N-WFGWX-YVC9B-4J6C9-T83GX
Windows 10 Professional N (Europe) - 	               MH37W-N47XK-V7XM9-C7227-GCQG9
Windows 10 Enterprise - 			                       NPPR9-FWDCX-D2C8J-H872K-2YT43
Windows 10 Enterprise  N (Europe) -	               DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4
Windows 10 Education -			                       NW6C2-QMPVW-D7KKK-3GKT6-VCFB2
Windows 10 Education  N (Europe) - 	               2WH4N-8QGBV-H22JP-CT43Q-MDWWJ
Windows 10 Enterprise 2015 LTSB (Long Term Servicing Branch) -          	              WNMTR-4C88C-JK8YV-HQ7T2-76DF9
Windows 10 Enterprise 2015 LTSB N (Europe) - 	              2F77B-TNFGY-69QQF-B8YKP-D69TJ

Once your done installing Windows 10 Install KMSpico to activate - but only get it from here otherwise you risk the install of malware and other shit. http://kmspico.org/2015/08/17/kmspico-v10-1-5/

That's it your done. Windows 10 is activated.