As the title says open cmd prompt. This can be done either by heading to start, all programs then you will find command prompt in accessories or alternatively head to start, run and type cmd.exe and press enter.
Step 2: The simple step (Telnet)
Type telnet towel.blinkenlights.nl and press enter
Step 3: There you have it!
IEnjoy! If you can't make it work here is a batch file I made which will start star wars for you. PLEASE COMMENT WITH ANY QUESTIONS.