On the page to buy Actlink for Quickbooks you need to scroll down to see this does not run under Vista. I made the mistake of buying it off the screen without seeing this warning (I have suggested it as at the top?)
This screwed up Act and SQL server - Tech support and I spent a total of nearly 24 hours over last week trying to get things straight. Last Friday a senior tech logged into my machine and spent nearly 3 hours to get it straight. I had spent the same that morning going through the unistall - re-install. That does not do the job. A manual edit of the registry is required and total removal of SQL server also. This meant having to set up SQL server for my other application again.
The QB Link does not run under Vista - you have been warned!