Unable To Connect To An Outlook Anywhere Exchange Server?

I have recently purchased a new laptop with Windows 7 Home Premium x64. I installed Office 2007, which has updated to SP3.Using XP I used to be able to successfully use Outlook 2007 for my office email, which uses a microsoft exchange server. I have not been able to get this to connect using Windows 7 despite using exactly the same settings. I have also tried a number of other combinations as advised from other sites but I can't get anything to work?This microsoft fix was also of no help... Error messages when you try to connect Outlook 2007 to Exchange Server: "The action cannot be completed" or "Your Microsoft Exchange Server is unavailable" or "Cannot start Microsoft Office Outlook".I have tried various username combinations: username or domainusername.I have tried various password security options.This is the error message I get: Outlook cannot logon. Verify you are connected to the network and are using the proper server and mailbox name. The Connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

I use the following setting:

Use Cached Exchange Mode - unchecked
Encrypt data between MicroSoft Office Outlook and MicroSoft Exchange
Server - checked
Connect to my Exchange mailbox using HTTP - checked
Proxy authentication settings: Basic Authentication