When i on my laptop the log on window start over

Hi

i think there is a problem with the operating system

if it is windows and you have the operating system CD then set the bios settings to detect the CD drive as first boot device

insert the windows CD and let it go to the setup area

the first time it asks for the repair or setup select setup
next after it checks for existing windows setup OS and prompts for new setup or repair select Repair - R

this will reinstall all the windows OS again keeping all the existing settings as they are

hope this helped
cheers

pls rate the solution

It is always useful if you post what operating system you are using as well as the version (such as Windows XP or Windows 7).
I would like to add that, by default in Windows XP, the system is set to automatically restart when the system crashes. Change this so that it displays an error message instead of restarting:
Boot into Safe Mode if you have to,
On the desktop, Right-click on the Computer icon and choose Properties,
Select the Advanced tab and click the Settings button in the Startup and Recovery section.
Uncheck the box beside 'Automatically restart' under the System Failure section.
Then, when it does crash, it will display a message that will indicate to a service technician or advanced user something specific about the problem, such as a corrupt display driver or hard drive failure (both of which I have experienced recently)