I have an Athlon machine with Win98SE on it. It was working fine till recently. However now, on booting it is sometimes giving a "Disk boot failure" message and sometimes it is booting normally. What could be the problem? Is my hardisk failing?

It's very likely that the hard drive is dying. I'd backup any important data immediately and then download a HD diagnostic utility from the HD manufacturer. Run that and see what it says.

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