Outlook Security

I wrote a program in Access that mails messages to my contacts telling them my e-mail address has changed. I keep getting the message that another program is trying...on my behalf. The first time I was asked if I wanted to allow this and I chose themaximum of yes and for 10 minutes but it kept giving me the "another program" message and I have to wait the 5 seconds. There's supposed to be a way of disabling this but I can't find it. I also don't have exchange, just a pst. How do I disable (andafterwards enable) this? Ol2002