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Normally I would just suggest MalwareBytes (my first choice) but your already ahead of me on that...
Options would be:
-AVG
-Avira
And there may also be a free version of McAfee out there (not 100% sure on that one though)
I believe the G430 is related to Logitech's semi-new line of LED gaming keyboards and mice.
-Noise Cancellation
-Surround Sound
-Comfy Ear Pads :)
It really depends on how you feel about Logitech. Personally I've had a positive experience with a lot of their products.
-Plug-and-play...
Turtle Beach headsets are nice.
There's a great range of options too that will fit within your budget and performance expectations.
Here's a link to check out:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=turtle+beach&N=-1&isNodeId=1
http://www.tomshardware.com/answers/id-1721955/repairing-toshiba-satellite-p850-12x.html
This user explains better how they disassembled their satellite. Try and compare what you see on yours and how they explain it.
Could be a few things...fan could be dead, or too much dust?
I would try cleaning the fan first...
In order to do so you hafta take the keyboard off first. Here's a helpful link:
http://www.laptopkeyboard.com/Guides.php/Toshiba/Satellite/P850/KBT850
After that there's button/press fixing to...