Pues eso es exactamente lo que me ha pasado tras instalar Service Pack 2:
Cuando pulso con el botón derecho del ratón sobre un archivo o intento
eliminarlo con el teclado, se me queda el ordenador trabado, hasta que sale
un error de drwtsn32.exe y una vez finalizo el proceso se reinicia
explorer.exe.
Por si a alguien le ha pasado, en mi caso el problema estaba ocasionado por
alguna instalación de divx o dr.divx (hace tiempo que no lo tengo pero
quizás se dejó algo en el registro).
La solución la encontré aquí y la pego debajo:
http://www.winxptutor.com/sp2/divxcrash.htm
Right click causes an error and crashes Explorer.exe after installing
Windows XP SP2?
When you right-click on a Desktop icon or a folder, the pointer changes to a
hourglass, Taskbar disappears and after about 30 seconds the screen comes
back to normal and still no right click options are available. This behavior
may be seen after installing Windows XP Service Pack 2. However, it's not a
problem caused by Service Pack 2, but an incompatible Context-menu handler
from DivX.
Update 9/8/2004 : DivX software and Windows XP SP2 or
http://support.divx.com
DivX 5.2.1, DivX Pro 5.2.1, and Dr DivX 1.0.6 have been released. These
versions are compatible with Microsoft Windows XP SP2 and can be downloaded
from www.divx.com. Please follow the guidelines below only if you wish to
use older versions of these products on Windows XP SP2.
RESOLUTION (for older versions of DivX)
Eliminate the context-menu handler from the registry, or disable it
temporarily using ShellExView tool.
Method 1: Eliminate the context-menu handler
Click Start, Run and type REGEDIT. Navigate to:
[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\EncodeDivXExt]
Backup the key to a REG file, and delete EncodeDivXExt key
Close Registry Editor and restart Windows
Method 2: Disable the DivX context-menu handler using ShellExView tool
See this page for more information on using ShellExView utility (see Method
2 in that page). In ShellExView, the entry might read as EncodeDivXExt
Module
More information from DivX.com Forums, regarding DivX and the problems with
Windows XP Service Pack 2
http://forums.divx.com/viewtopic.php?topic`461&forum$
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