ipads and downloads

I am new to ipads so bare with me. Installed itunes on windows 7 and synced with ipad 2. Configured my wireless for guest user account and accessing internet no problem. From itunes, I downloaded logmein app (free) and synced. I can see the logmein icon on the desktop but when I click I get the message "unable to download application. Logmein could not be downloaded at this time". I tried downloading another app "autocad WS" and get the same message. What am I doing wrong? Also, I noticed in the itunes "app store", viewing the ipad apps I see the downloads but (installing) is greyed out. Thanks