I have a Dell Studio XPS 16 and am using Windows 7 Home Premium 64-bit. I use Norton Internet Security Suite.
For the last couple of months or so my computer has started to slow down and even freeze up sometimes after about fifteen minute of using the internet. I've run a complete system scan with Norton and Malwarebytes but haven't found anything. I'm wondering if this is a virus, malware, or something else. It'll be running fine for a few minutes and then will start slowly bogging down and then go very, very slow or freeze entirely.
I generally use Firefox, but have tried Chrome and Internet Explorer, and the same thing happens. I've run CCleaner and cleaned out unnecessary files. I'd appreciate some help in determining whether or not I have some sneaky malware causing this.
Thanks in advance for your help!