Lets try this:
Download and install
CCleaner.
When you start the program, you can uncheck whatever you want EXCEPT
System --> Temporary Files and Internet Explorer (you can keep History and Form History unchecked)
After that, run the Registry Sweep a few times (scan and remove entries a few times)
Then go to RUN -->
msconfig and press Enter.
Head over to the Startup tab and uncheck what ever you don't need.
(Note: unchecking a program doesn't mean you cannot start it again)Restart the computer and post back.