Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Win7 crash/slowdown, IDE/HDD problems

11 Nov 2009   #1

Windows 7
Win7 crash/slowdown, IDE/HDD problems

This will be my first post on these forums, I have been a long time lurker though. :P

I'll try to be as detailed as possible on the issues I am having with Windows 7, I am pretty sure they are all related.

It started out a few weeks ago, I started getting this error where Windows 7 would stop loading during bootup (stuck at the initial Windows 7 load screen), after a while of loading (2-3 minutes) the computer would go into a BSOD crash and reboot. After the reboot the same thing happened.

I tried going into Safe Mode but during loadup the system would halt when loading CLASSPNP.SYS ( \Windows\System32\DRIVERS\CLASSPNP.SYS )

Naturally I went into the Windows repair option that greets you after a crash, the system would sit there for a while and then it would perform a system rollback/restore and everything would be fine again.

But after a few days the same thing would happen again but were solved thanks to the repair option. Now these issues first happened after I had plugged in and installed my Blu-Ray burner, it's a LG BH08LS20.

BUT there has always been this other issue with the system.. Ever since I first booted up the PC (it is brand new and Windows 7 was the first OS to be installed on it) the IDE activity light coming from the motherboard didn't work. At first it would just shine with a steady light even when the computer was doing its POST checks, this was before the BD drive was even installed. I thought I had reversed the connector somehow so I switched it on the motherboard, now it wouldn't work at all, so I set it back so at least the light would come on. Keep this thing in mind, the IDE activity light I mean.
So since my first suspect was the BD-burner I disconnected it (removed the SATA-connector) but it did not solve the issue. So I reconnected that drive.
The next thing I tried was to install the ASUS drivers for the motherboard which came on a DVD.. It went through the process (I had only installed a select few before), and what happens? The IDE light starts working after the Chipset drivers are installed!

I restart the PC a few times and the IDE light works normally. But the next day the issue is back, Windows 7 still loads mind you but the IDE light does not blink, it sits there with a steady light.

I disconnect any USB devices that I have connected to the PC, and after I disconnect the monitor (it has a USB connection since for Windows XP Eizo has software that can "remote control" the screen for different colour profiles and it also doubles as a USB hub with 2 extra USB connections under the screen) the IDE light starts working. Now the IDE light issue was solved until today, now its back! Weird thing is, I have no USB gadgets connected besides my Logitech G15 keyboard and a Logitech MX518 mouse.

And today the I had problems using certain software in Windows 7.. Photoshop CS4 32-bit would not load, the whole PC would stall/slow down, this software worked when Win7 was newly installed. However the 64-bit version loads without a problem. VSO ConvertXtoDVD which has worked fine before did not want to load. I looked around the Task Manger but did not see any abnormal CPU usage, however there seemed to be a lot of activity on the harddrive. I thought that explorer.exe had a lot of I/O activity going on so I closed that down (End Task).. Now VSO would load (after a while), but Photoshop still freezes, even if Explorer.exe is crashed and then reloaded. Hmm? If I go to the Resource Monitor whenever I load Photoshop the blue line in the graph goes to the top and stays there, and the system becomes unresponsive.

Something tells me all this is due to the harddrive/optical controller on the motherboard, some driver issue of some sorts.. but its weird that the IDE light issue shows up even at POST? Is it possible to check for errors here? Also CLASSPNP.SYS is related to the HDD controller as I understand it?

So to summarize..
• Windows 7 would refuse to load, halting at CLASSPNP.SYS . Though the issue has not returned since I installed chipset drivers.
• IDE Activity light sometimes shines with a steady light, I thought this issue was solved when the chipset drivers and unnecessary USB devices were disconnected, but this has now returned. IDE light sometimes shines even at POST (usually it will start there, the IDE light does not go off when in POST and then it shines always. If the IDE light goes off during/after POST it will work normally, shining only when there is activity on the harddrives)
• Certain software which in the past has worked without problems now refuse to load/slows down the system. HDD activity in resource monitor is very high (though you dont really hear the HDD load that much).
• All these issues seem to be connected. IDE light not working, having to disconnect USB devices, high activity on HDD.

Here are the devices that are hooked up to the PC.
- WDC WD10EADS-00L5B1 ATA Device
- WDC WD5001AALS-00L3B2 ATA Device (primary(
- HL-DT-ST- BD-RE BH08LS20 ATA Device (primary)
- Optiarc DVD RW AD-5240S ATA Device

IDE ATA/ATAPI-controller
-Nothing on ATA Channel 0 (2 of them)
-Nothing on ATA Channel 1 (2 of them)
- Intel ICH10 Family 2 port Serial ATA Storage Controller 2 - 3A26
- Intel ICH10 Family 4 port Serial ATA Storage Controller 1 -3A20

Now I have Windows 7 installed on 2 other computers, one stationary (older, Intel C2D) and one laptop, no problems there!

So sorry about the long and perhaps confusing thread, but I wanted to get all the details in there :P

If you have any questions please just ask, I'll answer them ASAP. I will also upload a picture of the BSOD message I got when Windows7 didnt want to boot (CLASSPNP.SYS error).

  • Motherboard: ASUS P6T SE, lastest firmware
  • Intel i7 920, not O/C:d
  • DDR3 Tripple 6GB, 1600MHz
  • ATI Radeon HD 5850

My System SpecsSystem Spec
11 Nov 2009   #2


Attachment 36226



Overall, I doubt that the various errors are all that interconnected. Do you use "registry cleaners" perhaps?
My System SpecsSystem Spec
11 Nov 2009   #3

Windows 7

Quote   Quote: Originally Posted by H2SO4 View Post
Attachment 36226



Overall, I doubt that the various errors are all that interconnected. Do you use "registry cleaners" perhaps?
I have CCleaner installed, but I never used the registry cleaning function on it.

Right now I am leaning towards a complete reinstall, its only a few weeks old so I dont have that much to backup.

What do you think about the IDE light issue? Its driving me crazy trying to figure out whats up with that, since it shows up even in POST.

Btw, if I do a reinstall, should I change the SATA Configuration from IDE to AHCI instead? What is the benefit exactly?

Thanks for your reply.
My System SpecsSystem Spec

20 Nov 2009   #4


HDD activity in resource monitor is very high (though you dont really hear the HDD load that much).
I have the same problem with my computer.
Let's start from the begining:
I installed Win7 x64 couple days ago. Beside system I have more files on C partition now and I noticed that HDD drive started to have higher activity. This is really annoying because it slowing down every task which I do on my computer. It happens in 2-3 hours periods for about 2-3 minutes. At this time I can't do anything, even music player stops.

I look for solutions for this problem all over the Internet and I've done some changes but it didn't work.
Here is what I've tried:

1. Disable System Restore for all hard disks.
2. Disable scheduled disk defragmentation.
3. Disable SuperFetch Service.
4. Disable disk indexing and files compression for all disk drives.
5. Disable Windows Search service.

None of this solutions work for me. Unfortunatle the problem still shows up from time to time and it's killing me.
One more thing. Computer is new, it has maybe 3 weeks. Please let me know if you have any ideas to solve this problem.

My System SpecsSystem Spec

 Win7 crash/slowdown, IDE/HDD problems

Thread Tools

Similar help and support threads
Thread Forum
Any game related crash causes massive computer slowdown
I have a high end system i5 3570k @ 4.3Ghz 1866 Corsair DDR3 EVGA 970 FTW kingston Hyper X3 120GB for OS Samsung 840 EVO 500GB Seagate barracuda 1TB Corsair 750RM PSU Win 7x64 Home prem
How to recover Win7 Pro upgrade from Win7 Home Premium post HDD crash
Greetings - This is my first time here and am very thankful for this great collection of forums and this community. I am trying to recover from a VAIO laptop HDD crash to Win7 Professional upgrade. I had finished working, shutdown Win7 Pro. cleanly. Drove home, attempted to launch Windows...
General Discussion
Huge slowdown, and hard drive problems.
Hello, around 3 months ago i got a new computer, which in my eyes is decent, can run almost everything i throw at it, but here is the thing. I had 2 perfectly fine hard drives, and a month ago one started to fail working. It started making wierd noises inside my pc case, like its starting to spin...
General Discussion
problems aft pc crash
hi everyone! my pc system is recovering from a serious crash resulting from a partition chaos (i happened to have been the cause ) so - the pc boots again ... BUT, there are some issues ... 1) windows 7 boots ... then goes into "starting...
General Discussion
Weird slowdown problems
Hello guys, im new around, congratz for the forum it's pretty informative. -Computer composition- Cpu: Q9300(with a thermaltake cooler+fan) M/B: p5n-d Ram: 4*1gb ddr2 800mhz corsair Gpu: gf 9800 gtx 512mb Psu: 750w thermaltake HDDs: 2*500gb seagate 7200rpm + 1 external 1tb seagate(usb...
Performance & Maintenance

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 14:44.
Twitter Facebook Google+