What are you doing in Outlook at the time you get the error? What other programs are you running? What's your computer specs? How much hard drive space do you have remaining?
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
Outlook