http://forum.microchip.com/tm.aspx?m=192175
By the way, it seems to me that PICKit 2 becomes more and more
popular judging from the posts from Microchip Forum.

************************************
Quoted from the post:
"
This error typically indicates a short or heavy load condition on the target
board, including a part socketed backwards. If the error goes away when
nothing is connected to the PICkit 2, it indicates a likely target board
problem and the information in this post is not relevant.

Older PICkit 2s produced before very early 2006 may be damaged by
shorting the VDD output to ground, or pulling large currents out of the
VDD pin.  PICkit 2's produced since then should not experience this problem.

Constantly getting the message "VDD Error" on software versions 1.20
and later, even when the PICkit 2 is not connected to any device is the
prime symptom of damage. On older software, this issue would be seen
as low VDD voltage when VDD was turned on but no device was
connected. This causes programming to fail

unless an external power supply is used to power the part.


The damage can be fixed in most cases by replacing damaged diode
D4 in the VDD path. Diode D4 is located near the button switch, by the
"target" LED. The recommended replacement is the Zetex ZHCS1000TA,
a high-current Schottky diode.
"
************************************
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