Normally when a laptop overheats it just switches off. In the case of this Advent Roma 1000 it would blue screen.
I knew the blue screen was caused by hardware as I had only just installed Windows and drivers before the laptop started blue screening.
Luckily the heat sink and fan are easy to get at on an Advent Roma 1000.
The heat sink should now lift up. Be careful as the copper pipe can bend.
The dust collects between the fan and the exhaust under the black tape.
Using a paper towel remove the old thermal paste from the copper heat sink. Also remove the residue from the CPU and Graphics Processor (GPU).
Carefully reattach the heat sink to the motherboard. Note that the 4 screw holes on the heat sink are numbered, carefully tighten them in that order.
All the photos are here for you to use freely.