Please confirm whether your operating system is genuine because it is most likely that your Windows does not pass "Windows Genuine Advantage Validation". According to Microsoft official web page, system will start to verify your operating system after Windows Update. If your PC fails genuine validation, you may occasionly receive a message reminding you that "Windows might not be genuine". Besides, desktop wallpaper will change to a plain black background. You may reset desktop background to a favorite wallpaper, but it will reset to this plain black background every 60 minutes.
For more detail, you may refer to Microsoft official web page:
This is because the current CPU fan rpm is lower than the "Fan Low Limit" set, therefore a warning sign will appear. This can be corrected by going into EasyTune5 then in "Settings" under "PC Health" you will see an option where you can set the Fan low limit for the CPU fan, please make sure it is set to lower rpm than the current CPU fan speed.
AHCI is a programming interface for SATA host controller. It provides new features, such as NCQ and hot plug, to increase performance. If you want to enable AHCI, please kindly set "SATA RAID/AHCI Mode" as AHCI in the BIOS. Then, install Intel ICH6R/ ICH7R/ ICH7DH/ ICH8RSATA RAID driver in Windows XP/2000 O.S.