Okay, I 'm stumped. My laptop, a Gateway NV57H, starts up fine, but after 10 minutes or so it becomes incredibly slow and everything is unresponsive. I used to get a bluescreen error after it being in this state for a while, but I researched it, ran a memory diagnostic, and found out one of my sticks of RAM was fried. Replaced both, doubling the capacity to it's limit (8GB) and I still have the problem. When task manager is open during all of this, it shows that I'm only using 1.6 GB of the 8GB of RAM available, so I've pretty much eliminated that. I ran chkdsk and sfc /scannow from the command prompt, both said there were no errors found on the hard drive. I've done virus scans periodically and they also show up clean. I'm running another now, using Malwarebytes which I updated yesterday. The laptop runs fine in safe mode, no lag and no errors. Does anyone have any idea what the problem might be and how to fix it? Thanks!