How to explain

well i dont think any one can help but i might as well try
well a couple of month ago my computer was workin just fine then one day i try to turn it on and it says: "theres been a change in the hard drive, please insert CD" or something but it didnt come with a cd and wen i put exit it loads and takes me back to same thing
and im using my moms comp and she got pissed and put a password so i can barely use it now so i need help

 

I'm not sure, but I think a virus infected your computer. Try an antivirus program, like avast! Home edition (free):
http://www.avast.com/eng/download-avast-home.html
And make sure to register it here:
http://www.avast.com/eng/home-registration.php
Don't worry, the registration is free, you'll get a code with which you'll be able to use avast.
Once you get it, install avast, and then run a scan. Delete the infected files.

 

thanks but the problem is that i cant even start it
so i cant even download it
that menu opens up when i turn it on and i cant get it off

 

The CD that it's asking is the Windows CD... if you have it, insert it.

 

i dont even have it
it didnt come with a cd

 

So you can't do anything at all in your computer? Like go to start menu and open programs?

 

no as soon as i turn it on that thing pops up
it pops up when my computer is staring up

 

Ah... I get it. It pops up in the black screen, before windows load, right?
That's bad :/ Because you can't do anything.
You should take that for fixing... it's not like we can help you much. The only thing that comes to mind is inserting your windows cd, but since you don't have it, then you should take it for fixing...

 

yes thats exacly wat happens
and yeah i have to find the time to take it
thanks for the help