Upgrade Dell Inspiron N5010 CPU

Questions:
I have a dell inspiron n5010 have an Intel Cor i3 M370 at 2.40GHz 3GB of DDR3 1333MHz ram and a 320GB hard drive. But recently it running very sluggish when i running Photoshop CS5, Battlefield 3, World of Warcraft, and Office Suites. And after defragged the hard drive and cleared up as much space, But it still runs slow. The questions is that, i am going to upgrade the ram to 6GM, and also going to upgrade the processor to i5 if it is neccessory.
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Apple A1286 , A1286 Battery
---------------------------------------------------------------------- Answers: It many wouldn't work any better with a core upgrade. I also see the i5 (quad core) uses a different socket then the i3.

Dell Inspiron N5010 CD DVD Drives Problems

Dell Inspiron N5010 DVD Drive Questions:

i upgraded my os from vista home premium to windows 7 and now my cd/dvd isnt working properly i cant even find it in my computer and devices and printer do i need to install a driver? im not very computer literate so help me please someone?

Apple A1245 Batteries  Apple Macbook Air 13" Battery

Answers:
Verify that the optical drive is enabled in the BIOS (press the power button and start hitting F2 key to enteer to bios)
If Drive still not detected, Load BIOS defaults.
Link for Microsoft fixit for optical drive