Slow laptop high CPU/R.A.M USAGE.?

my laptop is a Dell Precision with: Windows 7 professional, 64 bit Intel i7 16 gig R.A.M. additional 10gigs backup from memory. What i use regulary: Anti-Virus doesn't recognize anything- run daily whole computer scans De-fragment- scan every month and use if over 3% Registry cleaner- multiple times... show more my laptop is a Dell Precision with:
Windows 7 professional, 64 bit
Intel i7 16 gig R.A.M.
additional 10gigs backup from memory.

What i use regulary:
Anti-Virus doesn't recognize anything- run daily whole computer scans
De-fragment- scan every month and use if over 3%
Registry cleaner- multiple times daily (after every time on internet)

notice over half the time. my laptop is using 90-100% of all 4 cores and over 80% R.A.M.
at the times i am only using 1 window/program. when closed program it remains like this for a long time.

looking through the computer there are no which stands out background programs running. no updates required and/or running.

laptop/software cost over $2,000. i cannot afford any down time. use it for everything included school and work. this is my first business laptop. a few of programs are slightly different.
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