I've found another way to roll-back to kernel 3.2.0-37:
Start terminal
Type sudo apt-get remove 3.2.0-38-Generic
Press Enter (at some point during file removal it might ask again for confirming file delete - press Y)
Type sudo update-grub
It's funny how it seems no one is thouroughly testing the new kernels before release...
I've found another way to roll-back to kernel 3.2.0-37:
Start terminal
Type sudo apt-get remove 3.2.0-38-Generic
Press Enter
(at some point during file removal it might ask again for confirming file delete - press Y)
Type sudo update-grub
It's funny how it seems no one is thouroughly testing the new kernels before release...