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My computer was fine until I had a Blue Screen 0x0000007A.

Right after that happen, I did a full recovery backup with the Acer tool that they give with the laptop cause I wanted to reformat for a long time. Now the drivers are all up to date and Windows 7 x64 up to date.

But since the blue screen, my computer is so slow, it takes like 30 minutes to reboot. And it keeps freezing like 20 secs randomly(not the mouse, only the program stops responding).

I thought it was the RAM, but I did run memtest86 and I had no error.
What it could be? The HDD?

The weird thing is that it takes so much time to boot and that it's not slow when when it's fully started

The laptop is an Acer Aspire 8940g.

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What happens when you run it on battery? –  Daniel R Hicks Mar 6 '12 at 13:30
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Overheating? There's a tool called "Speccy" that may show you the temperature. –  pjc50 Mar 6 '12 at 13:35
    
@DanH Never tried, my dad let it plugged and on all day. I'm gonna take a look what happens unplugged. Do you think that a dead battery could cause this? Thank you –  Marc Mar 6 '12 at 13:38
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@Marc: Have you tried running in safe mode? If it does the same thing then I would suspect the hard drive is failing. –  James Mar 6 '12 at 13:53
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My Sony got to where it wouldn't run for 2 minutes on the adapter, apparently because the battery overcharge detector was tripping. Running it on battery worked fine, though, and once it went through one discharge/recharge cycle it was happy again. –  Daniel R Hicks Mar 6 '12 at 18:33

2 Answers 2

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This makes me think that your HDD may be bad. Download a tool such as SpeedFan and check the S.M.A.R.T. data.

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Does Windows offer to report your error a short time after you start the computer? After a BSoD, Windows collects data about the crash (hence the slowness) then offers to send it for analysis. After sending the data, Microsoft returns solutions for known problems, often in the form of a software or driver update. I have fixed numerous crash issues by using the "Report this error" feature.

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