Acer Aspire Windows 7 Keeps Freezing

I am using an Acer Aspire 5517, running Windows 7 Home Premium (Service Pack 1). While using it, every few minutes the system will hang. It becomes completely unresponsive and the cursor turns into a waiting icon (spinning circle) for anywhere from 30 seconds to a couple minutes before it becomes responsive again. It doesn't seem to matter what programs are running, I've seen it happen after a reboot while just using Windows Explorer. Norton Antivirus scans are clean. I also ran Malware Bytes, which cleaned up a few items but the problems persist. I'm not sure if there is other malware on the computer.