Restart the program, computer, or other device
System Restore - if your PC recently broke, use these instructions to "roll-back" to a previous, happier time
Combofix - if your computer has a virus and you can't run System Restore, use this free tool to disinfect it
Security Essentials - if you have bad or pricy virus protection, replace it with this free virus protection program
Google the error message for solutions
Information
Speedtest.net - measure your computer's Internet speed
SupportDetails.com - diagnostic information about your computer, web browser, and internet connection