какая операционка на тех трёх компах?

попробуйте поменять провайдер соединения на Microsoft OLE DB for SQL Server

там полиси надо прикручивать для имперсонизации контекста юзера под 7кой и XP, тк нужны права админа, а он есть не у всех

The action for the first step is dependent on the environment:
If you are using Active Directory Group Policies, edit the Domain Security Policy on the Domain Controller:
Click Start, Programs, Administrative Tools, Domain Security Policy

If you are not using Active Directory Group Policies, change the configuration on the local computer:
Click Start, Settings, Control Panel, Administrative Tools, Local Security Policies

Expand Local Policies and select User Rights Assignment.

In the right pane, double-click Impersonate a client after authentication.

In the Security Policy Setting dialog box, click Add User or Group.

In the Select Users, Computers or Groups dialog box, type the name of the Group or User who will run file.

Select Check Names and verify the name is correct.

Repeat the steps applied to the Impersonate a client after authentication setting to the Create global objects setting.

Solution
To troubleshoot a situation where the user account cannot be determined or to verify that the symptoms are caused by the user right:

Assign the Impersonate a client after authentication and the Create global objects user rights to the Everyone group:
If the program works correctly, the issue that you are experiencing might be caused by the new security setting.
If the problem continues after making these changes, contact Microsoft for assistance in verifying the configurations are applied correctly.