PowerShell 3 update-help (proxy issues?)

Question

I am running the PowerShell 3.0, as an admin, but update-help is not working. I suspect it does not know that we have an outbound proxy that requires: port, host, username, password. However WinHTTP API apps should grab this from the default credentials.
I expected PS to do this.
PS C:\Windows\system32> update-help
update-help : Failed to update Help for the module(s) 'ISE, Microsoft.PowerShell.Management, Microsoft.PowerShell.Utility, CimCmdlets, Microsoft.PowerShell.Diagnostics,
Microsoft.PowerShell.Host, Microsoft.PowerShell.Security, Microsoft.WSMan.Management, PSScheduledJob, PSWorkflow, PSWorkflowUtility, Microsoft.PowerShell.Core' with UI
culture(s) {en-US} : Unable to connect to Help content. Make sure the server is available and then try the command again.
At line:1 char:1
+ update-help
+ ~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Update-Help], Exception
    + FullyQualifiedErrorId : UnableToConnect,Microsoft.PowerShell.Commands.UpdateHelpCommand
Dr. YSG

Answer 1

Fhoffman's solution, is not working for me.
And I cannot follow the german (translated to english) (although I do speak some German) in Peter Kriegel's post.
PS C:\Windows\system32> $webclient = New-Object System.Net.WebClient
$creds = Get-Credential
$webclient.Proxy.Credentials = $creds
cmdlet Get-Credential at command pipeline position 1
Supply values for the following parameters:
PS C:\Windows\system32> update-help
update-help : Failed to update Help for the module(s) 'ISE, Microsoft.PowerShell.Management, Microsoft.PowerShell.Security, Microsoft.PowerShell.Utility, CimCmdlets, Microsoft.PowerShell.Diagnostics, Microsoft.PowerShell.Host, Microsoft.WSMan.Management, 
PSScheduledJob, PSWorkflow, PSWorkflowUtility, Microsoft.PowerShell.Core' with UI culture(s) {en-US} : Unable to connect to Help content. Make sure the server is available and then try the command again.
At line:1 char:1
+ update-help
+ ~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Update-Help], Exception
    + FullyQualifiedErrorId : UnableToConnect,Microsoft.PowerShell.Commands.UpdateHelpCommand
PS C:\Windows\system32> $creds
UserName                                                                        
                    Password
ysg4206`                                                                        
System.Security.SecureString
Dr. YSG