"1 hr, 26 min later", sounds like you are switched to PIO mode instead of DMA. Time to check and switch back.
To ensure your drives are operating in DMA mode: (1) Control Panel, (2) System, (3) Goto the Hardware Tab, (4) Device Manager, (5) IDE ATA/ATAPI Controllers, (6) Right Click on Primary IDE Channel --> Properties, (7) Goto the Advanced Settings Tab, Make sure both drop down boxes say 'DMA if Available', Click OK,(8) Right Click on Seconady IDE Channel --> Properties, (9) Goto the Advanced Settings Tab, Make sure both drop down boxes say 'DMA if Available', Click OK
If it will not change back to DMA mode by selecting it, uninstall the IDE Channel. To do that, open Device Manager as follows. Right-click on My Computer, select Properties, click on the Hardware tag, click on the Device Manager button, click on the plus sign to the left of IDE ATA/ATAPI Controller, right-click on Secondary IDE Channel, click on Uninstall.
After booting Windows will automatically reinstall the IDE channel and the DVD drive.