You can run 'sfc /scannow' from a command prompt to check the windows installation but spurious errors are usually a sign of faulty memory chips, faulty hard disk or the processor overheating. If the system runs fine from cold then gets progressively worse as it heats up that would point to the latter two options, if it runs faulty all the time then the memory. If you can get a Knoppix or PEbuilder CDrom disk to boot from you can isolate the problem between hardware or software. I agree most of those error codes never mean a thing in the real world.
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