Satellite A300: missing letters while typing fast & noisy fan

Hi
I hope someone might be able to help me.
I have had this laptop for nearly a year and slowly this is driving me mad. I have to type very slowly and deliberately when using IE.
For some reason it doesn't seem to pick evey key stroke up. It is fine when using office apps though. It seems to possibly be linked to the fan being on constantly.
Online games run slowly too.
I have bought an air duster can but not much came out of the fan area, so the fix that everyone keeps suggesting on here for fan issues hasn't helped, the fan is still noisy and it has taken me ages to type this.
Please help me!
Andrea

What plugins are you using in IE? Some plugins/toolbars can drastically affect the performance.
Have you tested it in FireFox or another browser? You can download FireFox from here: http://www.getfirefox.com
Did you install Windows yourself? Or are you using the factory Windows installation?
Maybe you are missing some drivers, for example if you have not installed the correct Graphics Drivers, Windows will run in VGA Mode (software mode), which is very slow.
Have a look in Device Manager for driver problems.
It can also be caused by installed software. Perhaps you have two Antiviruses installed? Maybe you should try backing up your data and running Recovery. That would determine if its a hardware or software problem.
A BIOS Update may also help. You can get the latest BIOS from the Toshiba website in the support section.

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Satellite A300: missing letters while typing fast & noisy fan

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