From The Rooke's Nest website:
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Right-click "My Computer", select "Properties" from the pop-up menu, click the "Device Manager" tab, expand the Disk Drives entry, double-click your disk drive, click the "Settings" tab, then set the check for the DMA box if it's cleared. Click OK. Restart your PC. Repeat for each disk drive and even the CD-Rom (if it supports DMA).
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I've looked here, and the checkbox is clear.
I couldn't say how old our computer is: at a rough estimate, I'd say I've had it two years, but it was second hand when we got it. We had to give it a complete re-fit, though, when a virus destroyed that hard-drive. So I've no idea.