You can disable the error reports like this:
Windows 7
Open Start, and type "problem reporting settings" into the search box. Select "Choose how to report problems". You can also go to Action Center → Change Action Center Settings → Problem Reporting Settings.
In the window opening, select "Never check for solutions".
Windows Vista
Open your Control Panel, select "Classic View" and open "Problem Reports and Solutions". Look for "Tasks" on the left and click "Change Settings".
In the newly opening window, select "Advanced Settings". Under "For my programs, problem reporting is…", select "Off".
Windows XP
Right-click "My Computer" and select "Properties". Click the "Advanced" tab in the newly opened window and select "Error Reporting" at the bottom.
Here, select "Disable error reporting" and click OK.