Error: USB device over current status detected

A few days ago when I booted my system, I was stuck at POST screen with following error message:

USB device over current status detected.
00 USB mass storage devices found and configured. 

I searched the internet (on another system) and found out few solutions but nothing could solve my problem. Then luckily, I looked at my front panel USB port on my computer cabinet and found out that someone (not me!) had mistakenly inserted 3.5mm TRS plug into USB female. I removed it, then rebooted my system and everything was back to normal.

Error in virtualbox: "No suitable vboxnetflt module for running kernel found"

If you get this error during boot on console:
"No suitable vboxnetflt module for running kernel found"
and you are unable to run any virtual machines inside virtualbox, then you are missing the linux kernel required to run this version of virtualbox.

This log (from debian lenny) provides some useful information (Lines 90, 91, 92, 108, 109, 110 are worth noting):
http://codepad.org/twhonwWA

So, find out the version of linux kernel you need and install it using your package manager.

Thanks to folks at #debian, #vbox (at freenode) for help.