Windows XP is not booting up in Acer Laptop

I have a notebook (ACER, no CD or DVD ROM) and Windows XP is installed as the operating system. When I start it, I can see the ACER logo but after that a black screen appears with the error messages given below-
“Windows could not start because of an error in the software.
Please report this problem as:
Load needed DLLs for Kernel.
Please contact your support person to report this problem.
Even when I press into entering bottom, the logo appears again with the same screen.
Can anyone please help me in this regard?
