Toshiba laptop not working

I have no information about computer .I have Toshiba laptop when i turn on it shows

"windows failed to start a recent hardware software change might be the cause to fix the problem
1. Insert your windows installation disc and restart your computer
2. Choose your language setting and then click next
3. Click repair your computer
other options
if power was interrupted during setup choose start windows normally
safe mode
safe mode with networking
safe mode command prompt
last known good configuration (advanced)
start windows normally
seconds until the highlight choice will be selectd normally"
when i try to choose any option i cant do anything please let me know what to do
Please let me know what to do....
RV