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Windows7: classpnp.sys problem

Last response: in Windows 7
May 21, 2011 3:57:45 PM

My PC specs: Dell OptiPlex980 Win7 64-bit. I can only load Safe Mode with Networking, last driver loaded classpnp.sys. Changed BIOS driver-SATA from "RAID Autodetect/AHCI" to "RAID Autodetect/ATA" otherwise get Blue Screen of Death with STOP message with 0x000...007B. Any suggestions to fix?! Thanks in advance.
May 21, 2011 6:18:40 PM

Side Note: Forgot to mention I just recently plugged a USB for external hard drive Western Digital MyBook 500GB so it may not have been compatible with Win7 64-bit..but now how do i get rid of the classpnp.sys poblem?