Hi Alexander Sun,
Regarding the OpenAccess item not showing in the "Add New Item" dialog, you must have in mind that such an item can only be added to a project that targets .net framework 3.5 or above. Please make sure that the items in this dialog are not filtered for an earlier version of the .net framework.
Regarding the DSW issues that you mention, we have seen this in rare cases and only in a broken installation, for example:
if you had a previous installation of the DSW and then installed the SP release that is the first one to include the DSW in the OpenAccess installer
I would suggest that you do the following:
1. when you try to invoke the DSW and visual studio suggests you to remove the commands you select to remove them
2. uninstall OpenAccess ORM
3. remove all DSW installations if you have any
4. remove all Telerik OpenAccess assemblies from the GAC
5. download the latest version of Telerik OpenAccess ORM (you must have in mind that the bits were updated a few days after the date that is shown) and install it
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