PsExec Access is denied

On Windows Vista and later, if UAC is enabled, a process launched by psexec -- even when run from an administrator account -- must have its elevate token set in order to get full privileges. This can be done by passing the -h attribute in the psexec command line. So, you would change your command to:

psexec -h -u wsadmin -p password cmd

For more info, run psexec /?:

    -h    If the target system is Vista or higher, has the process
          run with the account's elevated token, if available.

It took me hours to find a working way to PsExec between two Windows 7 Computers with non-Admin user starting PsExec ... Disabling UAC (EnableLUA=0, ConsentPromptBehaviorAdmin=0, LocalAccountTokenFilterPolicy=1) did not work, turning off the Firewalls did not work...

Here I found the working way - thanks JelmerS: (Info from PSexec is not connecting to machine using supplied username and password)

This is because psexec still tries to access the ADMIN$ share with your local credentials, before executing your command as another user. According to this thread, you can cache credentials before executing psexec:

cmdkey.exe /add:MACHINE_NAME_HERE /user:MACHINE_NAME_HERE\Administrator /pass:PASSWORD_HERE 
psexec.exe \\MACHINE_NAME_HERE -i notepad
cmdkey.exe /delete:MACHINE_NAME_HERE

I have found a solution:

Turns out that when you have UAC enabled psexec does not work as supposed.
Whenever HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA is set to 0 psexec works as expected.

Here is what worked for me, it doesn't get rid of UAC completely but turns it off for administrators

Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\User Account Control:Run All Administrators in Admin Approval Mode - Disabled