Yes, it could be, but I really think it’s software. Is there any kind of a pattern? Such as you open outlook and your screen freezes, the fans kick in on high for a moment and then the screen freezes…?
Before you go spending hundreds of dollars on a new pc I would update your graphics driver, your chipset driver, and your hardrive driver. I could provide all of the above for you, if you give me your computers make model… . If you want to do it yourself than go to the manufacturers website with your make and model and find all of the above. There are a few driver updaters out there that work free, but some are sketchy and could have viruses. Other work well for free, but are filled with pop up’s and prompts trying to upsell you to the pro versions and get you to download other apps. If your willing to try one I would recommend driver reviver, but as soon as your done with it get it off your pc or the pop ups won’t stop.