Pls try on ur keyboard shift + alt + arrow keys.

Basically probably ur boot.ini file broken or some necessary files ar mising. If you start ur pc with any boot disk like windows xp 7 8 and install new windows. I believe your problem will be fixed.

Did you format your computer recently?

Hi, Your computer support 8 gb ram (4+4) So u can upgrade it to 8gb. If you format ur pc before heating problem start even you clean the inside it s gonna be heat and shutdown. For fix this problem. You need to go acer web site and install the power management software than it s gonna be solve ur problem good luck