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Windows 7: BSOD and Startup Hanging (classpnp.sys & "unmountable Boot Volume")

16 Sep 2011   #1

Windows 7 64bit
BSOD and Startup Hanging (classpnp.sys & "unmountable Boot Volume")

Hi there.

I'm having trouble with my father's laptop which is around 4 years old and is an Acer Aspire. I'm not sure how to find the actual model, and I'm not too knowledgeable with these things. I'll try the best I could to see if I could explain this thoroughly. The laptop has been working fine for a while, but it pisses me off because I never have time to deal with these stupid problems.

When Windows 7 (64bit) starts up, it gives the black screen that says "Windows failed to start. A recent hardware or software change might be the cause." It gives me the option to "start up normally" or "startup repair." If I start normally, it shows the Windows logo and the loading bar and then turns into a blue screen that says "ummountable_boot_volume" with a bunch of numbers that I can't even remember or copy down because the screen keeps disappearing a second later and restarts the computer.

If I try the "repair", it just shows a black screen with a white cursor.

If I go into Safe Mode, none of the options work. None of the Safe Mode options load. They all stop at "classpnp.sys". The rest of the options (Last Known Good Configuration, Disable Driver signature enforcement, etc.) either gave the blue screen or just shows a loading cursor, then gives a black screen with white cursor.

If I try the disc, and try the repair on the disc, it shows the baby blue Windows 7 background (with the flower-like swirls) and just a loading cursor. Then the cursor stops to a regular cursor and does nothing. It just stays like that.

If I try to install a clean Windows 7 with the disc, it does the same thing as above ^ (with the repair).

I already tried looking for other solutions online, but everyone's problem is solved with a clean install or Safe Mode or Command Prompt, or scanning hard drive for errors, etc. which I can't seem to do any of those things at all! I am also trying my best to find solutions to get working without having to delete everything off the hard drive because my dad knows nothing about backing up, so he might lose all his bookmarks, and my mother's important documents.

If anyone could help, I'd truly appreciate it! Thank you!

My System SpecsSystem Spec


 BSOD and Startup Hanging (classpnp.sys & "unmountable Boot Volume")

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