My computer boots up fine. When I click on the Windows Explorer, Control Panel, My Computer or My Documents icons on the desktop, the cursor changes to the hourglass for several seconds,then goes back to the standard cursor. The desired activities do not run, and Windows Task Manager shows explorer.exe at 50% CPU use (I have hyperthreading turned on). If I repeat the process, explorer.exe goes to 95-99% CPU use. I have run Spybot Search and Destroy, Adaware and the latest Norton AV, as well as the latest XP updates. The system runs fine when booted in SAFE mode. I had similar problems in the past. I found optimize.exe and roing_ on the computer. When they were removed the problem went away for awhile, but now the problem is back and I cannot find any trace of optimize or roing. Any help is greatly appreciated!

High cpu usage with xp explorer.exe. When selecting My Documents, My Computer, are anything that utilizes explorer.

I have same problems but when I do right mouse on taskbar or on desktop, repeating this several times gives me 90-99% of cpu utilization time on explorer.exe in task manager , but standardly with one right click on task bar it eats 50% of my cpu time on explorer.exe. If I watch some movie I will get pause effect if I do right mouse click on taskbar. I have windows 2000 sp4 ,2.4c HyperThread is off in bios ,1gb of rams ,Nvidia fx5600 , external audigy 2 nx sound card. Where is the problem. Should I reinstall ,Service pack 4 ,or video card drivers or should I sfc my windows 2000 , what to do I need some advice.