Have you tried doing a clean-up? Use a good registry cleaner such as Registry Repair by Glarysoft, it's free and you can get it here:
Registry Repair

Autoruns may also prove usefull you can get it,again free, here:
AutoRuns for Windows

You could also type msconfig in the run box and see what is or isn't starting at the boot process but Autoruns will help with this as well..

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