FPS drops while playing WOT from 45 to 10/Not heat issue

[Musketeer_Man]

Hi there, I've been playing on my factory made, Intel laptop and because it is a low-end computer, I run it on low settings and get about 45-50 FPS. But just about every day, my frames will drop considerably to about 10-15 and my entire computer performance will be extremely hindered. This will continue for an half hour at least or several days at most. The laptop is about 6 years old and it has always worked quite well for gaming considering it's price tag until the last month or so. I am still looking to upgrade and build my own pc but I want to keep using this until I get the opportunity and/or funds to do so. I don't believe it is a Heat issue because I run at about 39C while gaming. It could be a RAM issue and if so, how do I take care of that? Since it is a laptop I have been advised not to replace any parts or risk causing other issues with the computer.
My CPU specs are:
Intel(R) Core(TM) i3-2310M CPU @2.10 GHz
Ram: 6.00 GB
64 bit

 

[Musketeer_Man]

How would I fix it then?

 

[k1114]

If it's been 6 years since you've had a clean install of windows, I'd suggest that.

 

[Musketeer_Man]

Ok