Vista - Calendar not working

EURIKA!!!

I think I have hit upon the problem....if I am wrong PLEASE don't pelt me
with rotten veg..hehe...

I put in all my calendar agenda's e.g. reminders birthday etc... the first
time it worked ok... when i signed in later i got the error message "
windows calendar has stopped working blah blah blah.."

Quite by accident I turned off UAC ( User Account Control) in user accounts
and hey presto my calendar is working...

So I turned back on UAC..Calendar stops working..turned UAC off Calendar
works...
Maybe someone else can test this and see if I am correct??