uac using 100 cpu

i have both 32bit and 64bit vista installed but the 64bit was running at 90 to 100% cpu. It would not do it in safe mode and the 32bit does not run at 90 to 100%. to cut a long story short as soon as I turn UAC off cpu usage goes back to normal. I try'd reinstalling thinking it was a driver conflict but got the same outcome upon first boot with nothing installed. i even downloaded the 64bit again to make sure nothing was corrupt
Any idea's ?

Hello,
I have the same or similar problem.
Generally, explorer.exe will use 100% processor time (or thereabouts), but after the computer runs for a few hours it dies down.
As a workaround, I change the priority for explorer.exe to Below Normal from task manager ... works great for me.
- JB
Vista FAQ http://www.jimmah.com/vista/

It's probably building the initial search index.Just leave it on overnight. Once the index is built things will be more "normal" (whatever "normal" means when you're talking about a beta OS).
"Blackduck" wrote in message

i have both 32bit and 64bit vista installed but the 64bit was running at 90 to 100% cpu. It would not do it in safe mode and the 32bit does not run at 90 to 100%. to cut a long story short as soon as I turn UAC off cpu usage goes back to normal. I try'd reinstalling thinking it was a driver conflict but got the same outcome upon first boot with nothing installed. i even downloaded the 64bit again to make sure nothing was corrupt
Any idea's ?

I had a similar problem.. The refresh rate for any action was about 30-45 seconds (to open, close, or move anything) but mouse didnt lag. Except my task manager didn't show explorer.exe using 100% cpu. The performance tab said only 4% of CPU was being used, but when I booted in safe mode it was fine. How do you turn of UAC?? I will try to reinstall again and turn that off and see what happens.
"R.U. Zerious" wrote:

It's probably building the initial search index.Just leave it on overnight. Once the index is built things will be more "normal" (whatever "normal" means when you're talking about a beta OS).
"Blackduck" wrote in message i have both 32bit and 64bit vista installed but the 64bit was running at 90 to 100% cpu. It would not do it in safe mode and the 32bit does not run at 90 to 100%. to cut a long story short as soon as I turn UAC off cpu usage goes back to normal. I try'd reinstalling thinking it was a driver conflict but got the same outcome upon first boot with nothing installed. i even downloaded the 64bit again to make sure nothing was corrupt
Any idea's ?