DO THIS ONLY IF YOU ARE COMFORTABLE WITH OPENING COMPUTERS!!!!!!!!!

If your laptop's fan is spinning this much, then most likely there is some dust stuck in the cooling vents.

Open up your laptop. Then, using a can of compressed air (usually CO2) simply blast all the dust and dirt out of the laptop, including the vents and fans. This should do the trick.

If that doesn't work, then clean the heat sink of the CPU. If that doesn't work, then remove the heatsink from the CPU and apply some heatsink paste. Contact Acer if the above doesn't work.

DO THIS ONLY IF YOU ARE COMFORTABLE WITH OPENING COMPUTERS!!!!!!!!!

If your laptop's fan is spinning this much, then most likely there is some dust stuck in the cooling vents.

Open up your laptop. Then, using a can of compressed air (usually CO2) simply blast all the dust and dirt out of the laptop, including the vents and fans. This should do the trick.

If that doesn't work, then clean the heat sink of the CPU. If that doesn't work, then remove the heatsink from the CPU and apply some heatsink paste. Contact Acer if the above doesn't work.
Update
Three remarks:

1. Prevent the fan from spinning madly while you use compressed air.
2. Before applying new thermal paste, first remove old old paste.
3. Thermal pasted is used in small quantities.