Pass word.

if you use windows you must come o control paneluser account there you can select your account to protech with password and re-start....the protection mode where you should put the password will appear..

the answers here are all very good but there are easy ways around the windows password however if you do a bios password then it would only give them a black screen until they gave the correct password and is alot harder to get around first you have to restart your computer then depending on the maker of your computer you have to press a button (i know on my computer its the delete button ) but it could be different for you however the info should be displayed when you start up your computer or you can go online to the manufacturer's website and you can get it there once in the bios look for security settings and hit enter and there you will see a few options and you can use any and all of those to do different things like lock the computer from people adding things or changing your settings and of course one to lock the computer if this wasnt a good enough discreption on what to do add me as a friend and i can try to go tho it step by step with you

Since it seems everyone has given you how to change your password I will give you some examples of what makes a good Password or at least a strong one Ap3$Tr4* would be a strong password because it has a mix of numbers, letters (Upper and Lower Case) and symbols. This password also is a strong password due to its lack of words and even though it is a short password it would be Easy for you to remember yet hard for someone to figure out. I wouldn't use this password however because well I posted it up on here so yeah people who may know you might look it up on here. But this is how you structure a solid password also having it be random or as random as you can make it with out forgetting the better. Happy Securing your computer One Last Tip: Don't use your computers password for anything else as this will keep your computer safe. (Just an IT thing I have a different password for every site and even between my two computers their is a different password to them both.

You will want to use a combination of letters and numbers. I am told that if you use some name from your family history that is best. But one that isn't readily known and would not be easy for someone to figure out. Something obscure and that just you would know. Good luck to you.

The introductory introduction to using your computer should help you to set up your password. It is advisable to use a password you can remember and it must be a mixture of numerals and letters so that it will be confusing for people to open. DO nto record the password in a note book. Just memorise it and can only opened by yourself.

here, this site should help you: http://pcsupport.about.com/od/windowsvista/ht/nvistapassword.htm