Hello. I posted about a month ago when my 13-month-old Dell Inspiron N4110 was stuck in a startup repair loop. It needed a new hard drive, which I installed myself, and everything worked great for a couple weeks. Then the constant freezing started. I thought it was Firefox, since that was what I was using most often, but it turned out that *everything* would eventually start hanging--Word, Task Manager, iTunes; it even froze on shutdown a couple times. I tried disabling and reinstalling all the plugins in Firefox, I ran virus scans and diagnostics and troubleshooters and chkdsk, and no issues were ever found--until, I think, I downloaded Microsoft .NET framework when a Dell diagnostic tool asked me to. And finally the constant freezing stopped.
But then it started again a couple days ago. The computer starts up fine, but within a few minutes it will start hanging regularly--like every 30 seconds, the cursor either won't move or clicking on something gives me a "(Not Responding)" message at the top of the window. This lasts anywhere from 5 seconds to a few minutes. When I open Task Manager, the CPU usage fluctuates wildly (when Task Manager itself isn't frozen)--it's usually at around 30-60%, but will rise all the way to 99% and then down to 0%. This is when I just have one or two programs running--Firefox and Word--and I don't have many startup programs, nor a lot of programs or files on the computer in general. Once again, all the Windows, Dell, Malwarebytes, and Avast scans find no problems, and everything is apparently up to date.
I did just disable Flash Player in Firefox after noticing there were two Flash processes running in Task Manager; that has actually made it a little better, but it's still frozen a couple times while I've been writing this post. Can anyone give me any ideas about what might be causing this and how I can fix it? I'm not sure what other information you might need about the computer, but here's what I know: it's a Dell Inspiron N4110 running a clean install of Windows 7 64-bit; I just installed a new Western Digital hard drive (500 GB 7200 RPM). Thanks!
Edited by Frowenat, 15 June 2013 - 02:15 PM.