[flgmchbttrnw]

I have a amd anthlon, it has 512mb of ram, windows XP pro, and Norton, at idle using about 280mb of my ram. I have recently been having trouble with the computer, it has had trouble running in windows and in yahoo mail. Once I get on the internet it works slow but downloads pages and pics pretty well but still not as slow as when moving around desktop etc. I have run malwarebytes anti malware thinking I caught something.
now what I found interesting is that when I had the task manager up with nothing really moving around, under cpu usage it was at 100%! and then there are times when it operates properly, like right now the cpu usage seems normal. Now I confess to not know sh&t about computers, but that isn't right! like now as I move around the internet, the usage varies greatly and rapidly, like you would expect.
Does anyone have any ideas why this is happening intermitently to my computer. Right now it is running well.
I have tried very hard to download and use memtest86+ and finally made a copy on cd,(still zipped) hope that is right, but have not been able to use it to boot, i really don't know how.
Any advice about the 100% thing would be greatly appreciated
Doug

[Hybr!d]

Could be a virus, might be an idea to read the sticky guide in the forum and follow the instructions to get 100% cleaned up.