Powershell script to install Pidgin

Hello,

I want to install Pidgin in all the computers on the network and I want to do it via Powershell. I modified a script that i found and it looks like this:

$computers = Get-Content "C:\Users\administrator.INTERN\Desktop\Scripts\Pidgin\computers.txt"

foreach ($computer in $computers) {


#The location of the file
    $Install = "\\voyager\Software\015 Messenger Clients"

#The Install string can have commands aswell
  $InstallString = "$Install\pidgin-2.10.11-offline.exe"

	([WMICLASS]"\\$computer\ROOT\CIMV2:Win32_Process").Create($InstallString)
#Output the install result to your Local C Drive
	Out-File -FilePath c:\Users\administrator.INTERN\Desktop\Scripts\Pidgin\installed.txt -Append -InputObject "$computer"}

But when i execute it i get this messages:

Cannot convert value "\\192.168.9.104\ROOT\CIMV2:Win32_Process" to type "System.Management.ManagementClass". Error:"The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)"
At C:\Users\administrator.INTERN\Desktop\Scripts\Pidgin\install pidgin.ps1:18 char:2+     ([WMICLASS]"\\$computer\ROOT\CIMV2:Win32_Process").Create($InstallString)+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : InvalidArgument: (:) [], RuntimeException+ FullyQualifiedErrorId : InvalidCastToWMIClass

I know nothing about scripting.

Also if it is posible , does anyone knows hot to make it so Pidgin uses the windows credentials???

Thanks