Ever try to open your Act! database and see THIS?
Restarts can be intentional, but are often "surprises" after a computer downloads automatic updates, power surges or power outages, and other random reasons. Then (often on a Monday morning before coffee) you attempt to open your database and get one of these errors. Never the best way to start the day.
Act! uses SQL, which runs on your computer as a "background service" and starts up when your computer starts. Usually. When it does not start up before you attempt to open Act!, one of those errors is the thanks you get.
If you are using a shared database and no one can get in, do this on the database host (server) machine. If you are the only one who gets this error, do this on your machine.
1) In the lower left of your screen, type "services.msc" (without the quotes) in the Search bar (or Cortana... shown here):
on your computer:
3) Near the top left, select "Start (or restart) the service".
Now you should be able to open your database!
(Disclaimer: this is not always the problem, but I am seeing it frequently)
I know (believe me... I know),
it is inconvenient and a nuisance,
but it just takes a minute
once you know what to do.
Now you can get back to work.