Try tapping F5 or F8 for safe mode, if it go's after choosing safe mode, this will take a bit longer than normal start, Do a System Restore going back to a old date.
Start/Programs/Accessories/System Tools/System Restore, Look for bold dates
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details