No WebApps in "Manage Site Features"

Question

We have a standalone Sharepoint Foundation Server, Windows 2008, 64bit.
I have installed the Office Web Apps, everything was going fine, no error or such. Even the Products configuration wizzard gave me no errors.
After installing i saw in the "central administration", that the services where already started (in "manage services on the server"). Same at "manage service applications". Everything already was there for excel, word and powerpoint.
My problem is, i cant activate the features on my sites now, because on the "manage site features" i cant see any sign of the WebApps.
I can't open any of the files. In word, there is just a blank site with a header there, telling me in which path i am atm. In Excel i get the message: "An Error have occured. Please try again" I can see the ribbin above tho, but file wont open.
Any idea what i can to or what maybe the mistake is here?
Nina

Answer 1

I get the following error:
Get-SPSite : A positional parameter cannot be found that accepts argument 'Enab
le-SPFeature'.
At line:1 char:35
+ $singleSiteCollection = Get-SPSite <<<<  -Identity
http://zkemportal01 Enable
-SPFeature $webAppsFeatureId -Url $singleSiteCollection.URL
    + CategoryInfo          : InvalidArgument: (:) [Get-SPSite], ParameterBind
   ingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.SharePoint
   .PowerShell.SPCmdletGetSite
I switched <site_name> with our servername, but still there is something wrong.