When Windows or any of your applications crash or do not respond ,Windows displays a message to ask your permission to send an error report over the Internet.If you don't want all this to happen just follow these few steps:

1> Click Start and right click on MyComputer

 

2 > Select and click on Properties

3 > On the next window click the Advanced tab and on Error Reporting on the lower-right corner

 

 

4 > Check the option Disable error Reporting. If you still want to notify when a serious error occurs , then check the box Notify Me When Critical errors Occur. If you don't want any type of error reporting, Uncheck this option.