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#11
Have you checked out MSconfig and its settings. If not, go to the command prompt and run msconfig. Check all the tabs including boot and startup items and then run it in diagnostic mode. If the problem cannot be directly identified, try shutting down non-Microsoft services and restarting. If that works, enable the first 50% of non-Microsoft services and retry etc. Post your results.
If these steps don't work, consider resetting your bios to default values.