Mapping, strange issue with the Windows Server

This thread comes from here. I just tried to split it up because the actual question there has already been answered.

Whatever, forget New-PSDrive cmdlet. I tried it out with mapping. Here's my new error:

Exception calling "MapNetworkDrive" with "5" argument(s): "The network path 
was not found."
At D:\PowerShellScripts\Automatische 
Installation\scripts\Applications\Notepad++\Notepad++.ps1:14 char:1+ $net.MapNetworkDrive("Y:", $nas, $false, $serveraccname, $serveraccpwd)+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : NotSpecified: (:) [], MethodInvocationException+ FullyQualifiedErrorId : ComMethodTargetInvocation
Join-Path : Cannot find drive. A drive with the name 'Y' does not exist.
At D:\PowerShellScripts\Automatische 
Installation\scripts\Applications\Notepad++\Notepad++.ps1:15 char:12+ $install = Join-Path "Y:" "\Notepad++\Notepad.exe"+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : ObjectNotFound: (Y:String) [Join-Path], DriveNot 
   FoundException+ FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.Join 
   PathCommand
Start-Process : Cannot validate argument on parameter 'FilePath'. The argument 
is null or empty. Supply an argument that is not null or empty and then try 
the command again.
At D:\PowerShellScripts\Automatische 
Installation\scripts\Applications\Notepad++\Notepad++.ps1:16 char:37+ $process = (Start-Process -FilePath $install -ArgumentList '/S' -Wait -Verb 
RunA ...+                                     ~~~~~~~~+ CategoryInfo          : InvalidData: (:) [Start-Process], ParameterBindi 
   ngValidationException+ FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Power 
   Shell.Commands.StartProcessCommand
Errorcode:   

Start-Process : Cannot validate argument on parameter 'FilePath'. The argument 
is null or empty. Supply an argument that is not null or empty and then try 
the command again.
At D:\PowerShellScripts\Automatische 
Installation\scripts\Applications\Notepad++\Notepad++.ps1:27 char:25+ Start-Process -FilePath $install -ArgumentList '/S' -Wait -Verb RunAs+                         ~~~~~~~~+ CategoryInfo          : InvalidData: (:) [Start-Process], ParameterBindi 
   ngValidationException+ FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Power 
   Shell.Commands.StartProcessCommand
Installation of Notepad++ finished.

I used Write-Host for each $XXX to check myself, if the data is correct (e.g the login data) and yes it is correct. No extra spaces, no doublequotes and also I added the domainname, in front of the accountname.

Once again, I used the same command, and directly typed the networkpath, account and pw into the command. It worked. I first had the error, that the new drivename "NAS01:" is invalid, it's because it was too long already, so I used "Y:".

Here's the part of the script which is important:

$net = New-Object -ComObject WScript.Network
$net.MapNetworkDrive("Y:", $nas, $false, $serveraccname, $serveraccpwd)

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