Windows 7 start-up hanging "classpnp.sys?"

I have recently installed windows 7 ultimate 64 bit and have came across a problem where some times when I reboot my machine it will freeze on start-up (the logo screen) if I turn my machine off for 10 minutes or so and try again it will boot fine when I try to boot in safe mode it still freezes and gets stuck on "classpnp.sys"

I have tried start-up repair no luck

Any ideas?

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It seems like you have a Laptop amd its over heating?  Is your laptop fan working?  Power i on and see if you can hear the fan come on.

A full hardware check needs to be preformed.
Beretta006Author Commented:
Sorry its a desktop P.C and it isnt overheating.

What should i use to preform a full hardware scan?

Very popular.  If you cant download it, google it.  Its a bootable CD with lots of tools.

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PS, also check if your PC CPU fan working?  In BIOS, look at the CPU temp when it doesnt boot.  But eitherway, try the link above.
Beretta006Author Commented:
I'll give it ago thanks
You need a chkdsk

1. insert your installation disk
2. click on repair computer
3. select the command prompt
4. chkdsk DriveLetter: /r
5. wait
6. you are welcome.
how is it going over here?
Beretta006Author Commented:
Sorry for the delay here are the steps i have taken.

1. replaced the HDD
2. I have 2 sticks of 2gb RAM I took a stick out and rebooted to see if a stcik was faulty
3. Reinstalled Windows 7

I havn't ran the hardware scans yet, I am wondersing if this could be a PSU issue now
Beretta006Author Commented:
Sorry forgot to say that none of the above steps resolved the problem
If you can still login, goto Control Panel\System & Security\Administrative Tools\Event Viewer or by typing eventvwr on start menu

Goto Window Logs\System see any error and or post your event screenshot here. we might find some clue there.
Beretta006Author Commented:
Log Name:      System
Source:        Microsoft-Windows-Kernel-Processor-Power
Date:          20/09/2010 18:35:20
Event ID:      6
Task Category: (6)
Level:         Error
User:          SYSTEM
Computer:      Gamer-PC
Some processor performance power management features have been disabled due to a known firmware problem. Check with the computer manufacturer for updated firmware.
Event Xml:
<Event xmlns="">
    <Provider Name="Microsoft-Windows-Kernel-Processor-Power" Guid="{0F67E49F-FE51-4E9F-B490-6F2948CC6027}" />
    <TimeCreated SystemTime="2010-09-20T17:35:20.625000000Z" />
    <Correlation />
    <Execution ProcessID="4" ThreadID="56" />
    <Security UserID="S-1-5-18" />
Beretta006Author Commented:
not sure if this is the error that is causing the problem but none the less i shal update my CPU's firmware
Beretta006Author Commented:
I ended up replacing the P.C
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