My DVD drive hasn't recognized movies since the second to last time I upgraded and formatted my computer. It can do everything EXCEPT play movies. Install from DVDs, open burned DVDs, play music CDs, open burned CDs. I've tried changing between the DMA and PIO modes to no avail. Here is the error I receive when the DVD drive is double-clicked:

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Disk is not formatted
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Windows cannot read from this disk. The disk might be corrupted, or it could be using a format that is not compatible with Windows.
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OK
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If any other type of DVD is inserted, it autoloads fine. I'm using PowerDVD for the decoders, here's the decoder report:

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Detected DVD decoders
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DShow SW:
Name:"CLVSD.ax"
Company Name:"CyberLink Corp."
Version: 6.0.0.1006
Product Version: 6.0.0.1006
CRC32: 0xa31ebb5e
VID:2

W2k Upgrade=no
Win9x Upgrade=no
LCID=0409
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OK
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This problem has spanned two vastly different systems. In fact, the DVD drive is the only original piece of hardware. Any suggestions?