It will also check compress data. If error control is turned on you may want to check your phone line for noise. One way to check is to lift the phone receiver and then push any number to clear the dial tone. Listen closely to the line if you hear any buzzing or noise on the line contact the phone company and have them check the line. This will also effect you ability to connect at a high speed.
All programs can at one time or another cause an illegal operation error.
It normally means that the program tried to write to a protected area in memory. If this happens consistently with one particular program, you may need to reinstall the software package that is crashing on you. Please contact the software manufacturer for help. Reseting your start or home page is relatively easy. Once you decide what you want your home or start page to be you just need to set your browser to use that page.