Have you downloaded/installed any software that checks for updates? if so...
1. Right-click Start, and then click Open.
2. Double-click the Programs folder.
3. Double-click the Startup folder.
4. Drag the program that automatically checks for updated components or
pages from the Startup folder to another folder. This prevents the
from starting when Windows starts.
Have you just installed a Lexmark printer?
Go to start and type msconfig check whats running under startup...