Electronics

[walkingal]

I have a Compaq Pressario that is about 3 years old. When I watch a video, including short videos like on youtube, it shuts down. It feels real hot. After a few minutes, I am able to power it back up. I took it to the electronics store where I purchased it, and the salesperson said the fans may be dusty, and he told me to get a can of air compressor -- I think it's called. I tried that a few times, but it's still shutting down. Does anyone know what the problem could be, and what should I do?

Thanks in advance!