Three common places to store stuff like this in order of difficulty to implement (easiest first):
1. the windows registry - look up functions SaveSetting and GetSetting
2. a file on the hard disk - add a reference to the "Microsoft Scripting Runtime" in your project, then look up the File System Object to create, write-to and read-from files on disk.
3. a database - take a look at an ADO tutorial at somewhere like
www.w3schools.com
hth
Phil