Long time no see Cynthia.
Check Hard drive Iso is stored on for errors(file system option not scan for bad sectors), Defrag the same hard drive afterwards.
What was program your were installing, did it have anything to do with storage/ or install any driver for ide controller or an I/O operation
Suppose you could raise buffer a bit.
If writer and ISO/C: share IDE maybe change that so are on seperate channels. Or stick In SATA hard drive as well.