Hidehisa Watch

This last one works, is non-destructive, but there is one
modification.

After you rename the directory data_files to data_files.old, create a
new directory/folder called “data_files” — without this, sync won’t
be able to save your settings and won’t connect. It’ll just keep
prompting you for your user name and password. This was the case on
my system (Vista).

In Vista, the directory is
C:\Users\\AppData\Local\Google\Google Calendar Sync
\data_files

1) rename the data_files directory to data_files.old
2) create a new directory named data_files
3) restart gcal sync - you’ll be prompted to enter your username and
pw again
4) synchronize

Hope that helps.