HP 550 Laptop Overheatin​g

Hi, I currently have overheating issues with my HP 550, when i had bought this laptop gushes of air used to come out of the side air vents, but know theres hardly any air coming out, the fan usally comes on at the logon prompt with an AC Adapter, but when im on battery it comes on when i spend more than 10 mins on the computer, the fan temps reach up to 100 Degrees. Any help would be appreciated!
By the way my warranty is expired.
Computer Specs:
Intel Celeron 530 @ 1.73Ghz
1 GB RAM (1014MB due to memory allocation)
111 GB Hard drive
Windows XP Professional Service Pack 3

I have a similar problem, so I hope someone can help.
My temperature doesn't quite get to 100º, but when I am doing something a bit intensive the fan kicks in and the computer sounds like it's taxiing for takeoff. I imagine the fan / CPU / heatsink are clogged with dust as the air flow is pretty pathetic. Therefore I decided to get in and clean it.
I've seen the instructions for removing the keyboard and switch cover on the HP website but I hit a problem. I can get as far as loosening the back edge of the switch cover but my cover doesn't slide off effortlessly like in the video. I've applied as much force as I dare but it really feels as if something is holding it. I can lift the back edge by about 15º and that's it.
Can anyone offer advice on how to get the switch cover off? Or an alternative way to get in to clean the fan and CPU?
Thanks in anticipation.

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