I would get a cheap 16GB or 32GB flash drive. If you have a Staples near you they usually have sales. Make sure it or the external drive you use is formatted FAT32 because a MAC cannot read NTFS unless it has a special driver.
Edit: As dante12 posted does this computer power on or is it dead? If dead you would need to attach the drive to another PC and then transfer the files to a FAT32 formatted device. If it powers on and you have another PC you may be able to create a bootable disk and then transfer the files to the flash/external drive using it.
Edit: If you end up attaching it to another computer, you could attach it internally, using an external USB enclosure, or USB adapter. Because of the age of the computer, you may have an IDE hard drive. If the computer you are attaching it to uses the newer SATA interface you would need the enclosure or adapter.
Edited by JohnC_21, 23 June 2015 - 10:00 AM.