Always share the last time you used the canned air and at this age you would either change the heat sink compound or have it done if you don't do your own work.
About upgrades. The 3GB is a tip off this is a 32 bit OS so you would not change the RAM. The video after a quick look shows a laptop and just like most laptops, no slot to put in anything else.
i have a toshiba L640 i5 3gb with 320gb and radeon 4500series graphic ...and its over 3 years old all these years it worked just pretty good all game worked and it was nice and now past few months when i play like hot pursuit or mortal kombat new edition my laptop goes off on its own..wat could the problem be should i uprgade and is it posssible to upgrade? if i upgrade my ram and graphic card what could be suggestion to go for