Hello and welcome to the forum.
It's a bit difficult to analyze or contribute to any diagnosis with practically no real detail.
PFN_LIST_CORRUPT can indicate an issue with memory but may also indicate a problem storage device. So.......
First make sure your machine is configured properly to facilitate the collection of .dmp files.
Go to Start and type in sysdm.cpl and press Enter
Click on the Advanced tab
Click on the Startup and Recovery Settings button
Ensure that Automatically restart is unchecked
Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box
Ensure that the Small Dump Directory is listed as %systemroot%\Minidump << where your .dmp files can be
found later.
Click OK twice to exit the dialogs, then reboot for the changes to take effect.
Then:
Please read the first post in this sticky thread here
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Do your best to accumulate the data required.
Run the SF Diagnostic tool (download and
right click the executable and choose run as administrator)
Download and run CPUz. Use the Windows snipping tool to gather images from
all tabs
including all slots populated with memory under the SPD tab.
Likewise RAMMon.
Export the html report, put everything into a desktop folder that you've created for this purpose, zip it up and attach it to your next post (right click it and choose send to, compressed (zipped) folder.
Additionally, if you haven’t already, please take some time and fill out your system specs in your forum profile area
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Again, if you haven’t done so already consider upgrading to Windows 7 Service Pack 1 from here
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UPDATE READINESS TOOL.
Download and install the correct system readiness tool prior to installing SP1.
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And while waiting for a response regarding your issue some additional homework that you can perform yourself to move the diagnostic process along.
Check with your computer manufacturer or better yet your system board manufacturer and see if there is a BIOS update available, specific for your motherboard that may help in addressing system stability issues.
Check your hard disk for issues by using the native Disk Check Utility. Open an elevated command prompt and type
chkdsk C: /R
and hit enter. Answer in the affirmative “Y” when prompted and reboot your computer. Allow it to complete all five stages which will likely take some time (bigger the drive, longer it takes) and check the results in the Event Viewer when complete.
Check your system memory for problems.
Download Memtest86+
from this location here.
Burn the ISO to a CD and boot the computer from the CD from a cold boot after leaving it off for an hour or more.
Ideally let it run for at least 7 passes / 6-8 hours. If errors appear before that you can stop that particular test. Any time Memtest86+ reports errors, it can be either bad RAM or a bad Mobo slot. Perform the test on RAM sticks individually as well as all possible combinations. When you find a good one then test it in all slots. Post back with the results.
See
this Guide to using Memtest 86+
Good luck
Randy