From what I remeber about W95, there isn't such possibility to set the whole drive to "read-only".
My best guess is that the File Allocation Table is busted on your D drive and the system CAN'T read or write (Actually it can read first cluster of a file or folder). You should run any scan disk you have. Doesn't really matter if it is Norton DiscDoctor or windows scandisk. They work the same. Be sure to do a surface scan (system area). And expect heavy losses.
Also find some freeware or trial anti virus-spy-adware to cleanup the system.
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Posting Virtuoso
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since May 2006