On a secondary pc, I noticed ESC and TAB keys stop working randomly.
It happens only with a specific vm.
In the beginning it seemed random to me, but it was not.
It happens after restoring a vm from saved state.
I found some hint here Losing Tab and Esc Key Functionality in Microsoft Virtual PC 2007 (last comment by RayeR)
but I haven’t found root cause. 
Host configuration: Windows 7 build 7100, Virtual PC 2007 (6.0.192.0).
Guest configuration: Windows XP SP3 (win32k.sys v5.1.2600.5676, 15/09/2008 :/ ), VM Addition installed.
Everything works fine after moving the vm on Windows 7 (final release), Virtual PC (with Integration Services). ;)
Technorati tags: Windows7, Virtual PC 2007
