Resolution of the dependency failed." -or- "Exception has been thrown by the target of an invocation error in ACT

You are attempting to launch ACT! when you receive one of the following error messages: "Resolution of the dependency failed." -or- "Exception has been thrown by the target of an invocation."

Run As Administrator:
If you are using either Windows Vista® or Windows® 7, you may be able to work around this issue by launching ACT! with the Run as Administrator option. This is done by right-clicking on the ACT! icon and selecting
Run as Administrator from the dialog box.

Manually Rebuild ACT! Preference Files: (this is probably the fix for your problem.)

Alternate Method: Manually Rebuilding Preferences

If deleting your Preferences through the
ACT! Diagnostics utility fails to resolve this issue, you may need to manually rebuild the preferences. 
Please note that this process will remove all custom preference settings in ACT!. When you re-open the program, you will be taken through the setup wizard again. In addition, you will need to re-do any custom settings under the Tools/Preferences option. If you saved your ACT! Email messages, custom web links, and custom toolbar settings, you will need to restore them.
Delete the DependentDlls.xml File
If the above suggestions do not resolve the issue, then deleting the following file and allowing it to be rebuilt have resolved this issue in some cases. Please use the following steps: