overheating and strange smell on Dv7 notebook

I noticed that my system seems to be overheating and has a very peculiar smell. In fact, I thought he had a problem with our oven, so I kept in the basement to check it out.  However, it turns out my laptop being.  I used air jets to clean the vents, I cleaned the vacuum evacuation holes, but this thing continues to go into overdrive on the fan.  It blows constantly, and the laptop is very warm, if not hot, touch.  I also noticed that my system is very slow at this point.  So, I constantly have to shut it down.  Is there something I can do, or don't do that would fix this?

This smell actually makes me cough, and my throat is sore.  I really need to find the source and fix it.  I use a LOT of my system.

Thanks for your help, and here's my card on my system:

HP Pavilion Dv7 core i7 2.20 GHz Intel

Win 7 64 bit

Radeon HD

Similar issue on a dv6t, don't know if yours has this issue, might be worth checking

http://h30434.www3.HP.com/T5/notebook-lockups-freezes-hangs/all-dv6t-I7-owners-if-you-have-poor-performance-click-here/m-p/1434637

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