Take good precautions because the "memory cannot be read" (or a close variant) points to possible bad RAM memory or other hardware related issue. Insure you do not have bad, marginal, or flaky RAM memory chips. Likewise, insure you have good/steady electric power & no hardware problems.
Also, have good pc ventilation & adequate cooling. Beware overheating.
If you suspect a heating problem, first be sure there is sufficient space all around the pc case for air circulation. Be sure there is nothing blocking any air intake slots. Take a look at the power supply fan (usually in back of the pc case) to be sure it is not blocked with dust & gunk, and that it is turning when power is on.
Take a look at the system's Event Log:
Select Start button/ select Run , then type in
eventvwr.msc<enter>
-- or Go to Control Panel / Performance and Maintenance/Administrative Tools >Event Viewer.
Review the sections and look for Errors or Warnings that match the time the event occurred. Double click---the information "may" give a clue.
Run a RAM memory test. MEMTEST86 is one such utility.
See
http://www.memtest86.com/
Running a memory test is very highly advised in this case. As is deleting/clearing your Temporary internet cache files, and using Disk Cleanup.
But test RAM first ! Insure RAM is ok before doing anything else.
