UAC using 100% cpu

[Guest]

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 ?

 

[Jimmy Brush]

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/

 

[R.U. Zerious]

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).

 

[Guest]

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.