Hey everyone. I have a custom built pc that I had built 5 years ago. A few months ago, I upgraded my OS from XP to Windows 7. Everything seemed normal. A few days ago, I was using my computer when I started to notice some serious lag. Every program I had running was "Not Responding." I tried to open Task Manager, but at this point, my computer crashed. Upon restart, my computer took about 5 minutes to start, which was very slow compared to normal. When my desktop finally loaded, it was the same story all over again. When I started a program, it would soon be "Not Responding." So finally, I decided to format the harddrive, wipe the slate clean, and install Windows 7 from scratch. The installation process went smoothly and quickly. However, when I began using Windows again after the install, the same problems keep coming back. My computer is extremely slow and unresponsive. Any suggestions?