try this
You may analyze the Hijackthis log with the following link:
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Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
But most of crashing issues are caused by the hardware drivers and antivirus programs. I would like to suggest you update the BIOS and the hardware drivers for Windows 7 first.
If any blue screens are encountered, I would like to suggest you upload the minidump files via SkyDrive, and let me know the URL by replying this thread. For detailed steps on how to upload files with SkyDrive, please refer to:
Use SkyDrive to upload collected files and post screen shot/picture.
Collect Minidump Files
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1. Click "Start", input "SYSDM.CPL" (without quotation marks) in the “Search” bar and press “Enter”.
2. Switch to the "Advanced" tab and click the "Settings" button under "Startup and Recovery".
3. Under "Write debugging information" section, make sure the "Small memory dump (128KB)" option is selected.
4. Make sure "%SystemRoot%\Minidump" is in the "Small dump directory" open box and click “OK”.
If the Blue Screen appears again, please refer to the following steps to collect memory dump files:
1. Click “Start”, type “%SystemRoot%\Minidump" (without quotation marks) in “Search” bar and press “Enter”.
2. Go to your Desktop, right-click on it and create a new folder named "Dump".
3. Copy all the memory dump files (looks like [Mini092008-01.dmp]) in Minidump to this folder.
4. Right-click on the Dump folder, click "Send To", and click "Compressed (zipped) Folder".
5. Please send the ZIP file to us.
If it is inconvenient for you to upload the dump files. I would like to suggest you analyze them with Debugging Tools by yourself. You may install it and it’s Symbol Packages from the following link:
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WinDbg will tell you the possible cause.
If no clue can be found, you may contact Microsoft Customer Service and Support (CSS) via telephone so that a dedicated Support Professional can assist with your request. To troubleshoot this kind of kernel crash issue, we need to debug the crashed system dump. Unfortunately, debugging is beyond what we can do in the forum. Please be advised that contacting phone support will be a charged call.
To obtain the phone numbers for specific technology request please take a look at the web site listed below:
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Regards,