One program on your PC to read the data from your access database and write a command onto the (virtual) serial port connected to your Arduino. VisualBasic, VB.net or any other language from Microsoft and most languages for Windows PC offer the necessary functions to write this kind of program.
One program on the Arduino to read the command from the serial port and do what you want it to do. Look at the tutorial involving Serial.read() for an example how this is done.
One USB-cable to link your Arduino to your PC.
That’s all. Writing those simple programs is now left to you. From the scope, it’s a very nice beginner project to teach you about programming. I’m glad I could help you.