If the blue screen occurs at the same point each time you use it it could be errors on the hard disk. Power down the computer and perform a scan on the hard disk through windows. Be prepared because this can take several hours. If you still are encountering problems after this then the hard disk is most likely physically damaged and will need to be replaced. Here is a link to the troubleshoot guide for this computer: [[Compaq Presario V2414NR Troubleshooting]]