make sure.. system not being used on bed or sofa. look for the vents for any dust.. use a vaccump cleaner.. to clean it.
ran a 32 bit diags on fan... so confirm the fan is okay. else replace heatsink fan assembly... dont wait till your system starts shutting due to overheat.. then u might need to add the mobo along with the other 2 parts
The easy way is to just a cooling pad. If not, you could always buy some thermal paste and slather that all over the CPU/GPU. You can look for online guides about how to go about this sort of procedure.
The best way would be to take it apart and clean the fan and the heatsink with a dry brush. If you blow it with a compressor the fan could get stuck from the dust clogs so it's a very bad idea. Before puting back the heatsink be sure to clean the CPU very well from all the old paste, and the heatsink as well. After that apply some fresh paste (not much) then put it all back together. Make sure all the screws are screwed well. After turning it on, check the temps with HWMonitor.