--- Operating System, Graphics card ---
Windows XP32bit, intel quadcore, nvidia GTS450 (driver:306.81)

--- Blender version with error, and version that worked ---
since buildbot r53800

buildbot r53779 and before works.

--- Short description of error ---
I get this error when switching to rendered mode:

CUDA error: Launch failed in cuCtxSynchronize()


--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
default scene with cuda enabled

thank you