Your previous posts didn't mention which operating system you have on your PC.
My suggestions were for WinXP Pro.
IMAPI is a Windows service for burning CDs directly from the operating system.
The IMAPI CD-Burning service is not necessary for many third-party CD-DVD burning applications, like Nero, ImgBurn, etc.
If you want more details on its function just Google for it.
Some users have posted that disabling it solved their power calibration error windows, but try the other suggestions first.
One way to disable it is through the Control Panel.
Open "Administrative Tools", then follow by opening "Services".
This will open a window showing a long list of background services running or not running on your system and brief MS descriptions of their function.
Search for the IMAPI CD-Burning Service and double-click it.
The next window will provide an option for disabling it.
You can always re-enable it later if that is not the root of the trouble.