Unless you have an odd unit, there is no filter. Cooling air is taken in through vents. If they have become blocked, an over-temperature sensor will cut the projector off. Make sure the vents aren't blocked. If you see they are becoming bunged up with fluff etc, one easy fix is to use a vacuum cleaner. Fit the nozzle attachment with a small brush and press the bristles lightly around the vents. Do a quick pass over all vents before pressing the brush more firmly or you'll be in danger of sucking fluff in from vents elsewhere in the case. Once you've done that, you can pay attention to vents which appear more blocked than others.
Other than that, if it's overheating, you might want to check the lamp is clear. To do that, make sure the projector is disconnected and allowed to cool down. Then look in the user manual for "Replacing the Projector Lamp Module" and remove the lamp cover. Inspect and carefully remove anything that is blocking the space around the lamp. Even when cool, do NOT touch the lamp with your fingers because you will leave a trace of grease (even from dry fingers) on the lamp and that part will overheat and blow the lamp when you turn it on again!
If you haven't got the manual, you can find it on the HP site (HP and Compaq are the same company) at
http://h10032.www1.hp.com/ctg/Manual/bpj07856.pdf
Let us know how it goes and mark this question as solved or come back with more info if none of that helps.
Put few drops of glass cleaner liquid on a soft cotton cloth, rub well and dry with a cotton cloth a a facial tissue .
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