Dell inspiron 1525 keeps freezing

Depending on your operating system. You need to run a complete checkdisk. chkdsk /f from a command prompt. I would also flush your master boot records with the appropriate OS cd. Lastly I'd run a program like hard drive regenerator to deterimine if there are repairable areas of the drive itself. Otherwise you may need a new hard drive or a clean install of the OS

next time your computer starts go to a command prompt and type chkdsk/f it will ask you if you want to run chkdsk next time your computer starts ..say yes..and then restart the /f command repairs damaged sectors..that might help..