Packard Bells come with a restore partition, your friend should have a boot disk (Floppy) or cd /dvd.
If not boot the machine, and tap the F8 key until you see the black screen giving you boot options.
Choose "Safe mode"
And then try a system restore.
If that fails:
Enter your BIOS screen (Tap the DEL key on boot up)
Choose to disable all but the floppy (If your friend has one)
Reboot, with the floppy in the drive.
Bear in mind that all data will be lost if this procedure is implemented.