I downloaded Skype and messed up my mini laptop, can anyone help me?

I have a 3 year old Acer laptop. Model ZG5. Mini laptop, Windows Xp. I do not have restore discs. I downloaded Skype and it told me to go to my email to confirm. When I went to my email, the PC crashed. In the boot up menu, it freezes and does nothing in all the modes. Also, when the screen that counts down the seconds comes on, it freezes also. Help!!!