record by microphone restarts computer

My computer is Dell Dimension L100R

Problem: Audio; {Creative AudioPCI (ES1371) (WDM)}

Operating System: Windows XP Pro

Problem Description:
When I try to adjust a microphone with
Control Panel/Sounds, Speech and Audio Devices/Speech my computer restarts
after clicking. The same result I have if I use Start/All Programs/Accessories/Entertainment/Sound Recorder. The same result when I
use the Control Panel wizard to test hardware.
Everything is OK with playing voice and music. Help please to fix the problem!