Windows 7: BSOD error after ~30 minutes on

I encounter BSOD problem just after 30 min on the laptop(not exactly 30min)
Not so sure what is the main problem... But it does happen frequently...
by using bluescreenviewer i can see that this type of BSOD is always occur

A problem has been detected and Windows has been shut down to prevent damage
to your computer.

The problem seems to be caused by the following file: ntoskrnl.exe

DRIVER_IRQL_NOT_LESS_OR_EQUAL

If this is the first time you've seen this stop error screen,
restart your computer. If this screen appears again, follow
these steps:

Check to make sure any new hardware or software is properly installed.
If this is a new installation, ask your hardware or software manufacturer
for any Windows updates you might need.

If problems continue, disable or remove any newly installed hardware
or software. Disable BIOS memory options such as caching or shadowing.
If you need to use safe mode to remove or disable components, restart
your computer, press F8 to select Advanced Startup Options, and then
select Safe Mode.

Technical Information:

*** STOP: 0x000000d1 (0x0000000000000001, 0x0000000000000002, 0x0000000000000008,
0x0000000000000001)

*** ntoskrnl.exe - Address 0xfffff800032e2c40 base at 0xfffff80003266000 DateStamp
0x4e02aaa3

and

A problem has been detected and Windows has been shut down to prevent damage
to your computer.

The problem seems to be caused by the following file: USBPORT.SYS

DRIVER_IRQL_NOT_LESS_OR_EQUAL

If this is the first time you've seen this stop error screen,
restart your computer. If this screen appears again, follow
these steps:



Check to make sure any new hardware or software is properly installed.
If this is a new installation, ask your hardware or software manufacturer
for any Windows updates you might need.

If problems continue, disable or remove any newly installed hardware
or software. Disable BIOS memory options such as caching or shadowing.
If you need to use safe mode to remove or disable components, restart
your computer, press F8 to select Advanced Startup Options, and then
select Safe Mode.

Technical Information:

*** STOP: 0x000000d1 (0x00000000504564e0, 0x0000000000000002, 0x0000000000000000,
0xfffff88002efec55)

*** USBPORT.SYS - Address 0xfffff88002efec55 base at 0xfffff88002eec000 DateStamp
0x4ce7a670

do tell me if i need to attach any minidump or not??
and bluescreen never happen if I on with my battery only but if I plug in charger bluescreen do appear
thanks in advance

Blue Screen of Death (BSOD) Posting Instructions

noted

Install and perform full scans with:

• Malwarebytes : Free anti-malware download
• Microsoft Security Essentials | Protect against viruses, spyware, and other malware

Remember to install the free version of Malwarebytes not the free trail; untick the free trial box during installation. MSE is the most lightweight and compatible with the Windows 7 operating system.

You can also view this thread for a complete free and lightweight security protection combination:

• Good and Free system security combination.

Memory:

• RAM - Test with Memtest86+

Run Memtest86+ for least 7-8 passes, and preferably overnight as it can take a while to fully complete.

Test each RAM stick individually, if an error is found then move the same RAM stick into the next DIMM slot and test again, if errors are found for the same RAM stick in every available slot then you have a faulty RAM module. On the other hand, if no errors are found in the next slot or the other slots for the same RAM module, then you have a faulty DIMM slot.

Test each RAM stick and every motherboard DIMM slot available.

Remove:

Windows 7 doesn't require any programs which make changes to the operating system and registry, these programs tend to cause problems by modifying and deleting files.

• Registry Cleaner Tests - Why NOT To Use One!

Remove:

This motherboard bloatware, which can slow down and corrupt your system.

Reduce the number of programs at startup, to avoid any driver or program conflicts:

• Troubleshoot Application Conflicts by Performing a Clean Startup
• Startup Programs - Change

thanks for your time...all item listed for remove had been removed... preparing for RAM test..

Your welcome, please post your results when you have completed the test.

I had done the memtest... I let it to do until 18 pass..no error detected.. but sadly there are still BSOD occur to my laptop..do it relate to other hardware like hard disk or motherboard...

sorry for my bad photo

Perform the full scans with the scanners provided first, and then we can look into other options.

if u mean the two scanner, Malwarebytes : Free anti-malware and Microsoft Security Essentials, I have scan and no virus/malicious detected.. do I need to scan with the other scanners?

I will perform full scan again

You could scan with SuperAntiSpyware will is provided within the Good Security Combination link, and let's begin testing the hard-drive for any issues:

Run some hard-drive diagnostics and follow these steps:

• Hard Drive Diagnostic Procedure

Find your hard-drive manufacturer and run their tests.

Additional Tests:

• SeaTools for DOS | Seagate
• CrystalDiskInfo - Software - Crystal Dew World

Post a screenshot of Crystal Disk Info summary:

• Screenshots and Files - Upload and Post in Seven Forums

Check for any file system errors and bad sectors using Option #2 of:

• Disk Check

Use this command with Disk Check: