Have you tried going to the 'Last known good configuration' and see if it will boot normal then?

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Download gmer.zip: http://www.gmer.net/files.php
Unzip the file, and double click on gmer.exe, select Rootkit tab and click the Scan button.
When scan is completed, click Save button, and save the results as gmer.log
Warning ! Please, do not select the "Show all" checkbox during the scan.
Post the log to your next reply.