The DS instructions are there sorta. but they tell you how when you are logged in
To reset the DS you will have to power it off since you do not know the password which is always sad. When it powers on and the screen says press etc for etc. Hold down the left shift key and start pressing F8 like a madman. If it boots to windows you are lame and have to try again. JK, it is hard to hit
When you get the F8 startup options, press F8 again for more options. Top choice should be Highlighted, repair your puter
Enter, and a Windows GUI should load. Then click troubleshoot>system image recovery. This will replace the C: drive with the original Out Of The Box image.