Hello and welcome to Just Answer! I am Aitizaz and i will assist you today.
I am sorry to tell you that this problem is related to the operating system you have installed on your computer i.e. WINDOWS
but do not worry, this is a curable problem. Please answer a couple of questions before we proceed with the solution:
1. Do you see a blue screen with this error message on the screen when you turn on the computer or you are able to get to your desktop?
2. Do you have windows disk with you? if not, did the computer come with windows pre-installed?
in this case, basically we need to either REPAIR the windows or re-install it. if we are able to repair the computer, we will not lose any data. however, if we go for re-install, you will lose everything ont he C drive at least
we can try to repair the windows first. Let me check keys to do that on a Toshiba laptop and i will get back to you
please restart/start the computer and start tapping the F8 key as soon as you restart/start
a screen with multiple options will appear. please let me know if you see REPAIR YOUR COMPUTER option there
please TAP the F8 key when you start the computer. press it continuously