When I was using the cleaner it sent me a critical error window with the following:
"The thread attempted to read from or write to a virtual address for which it does not have the appropriate access
CCleaner v2.05.555
MS Windows XP Service Pack 2
Intel Pentium 4 CPU 3.00GHz
767MB RAM
NVIDIA GeForce 6800 GS/XT (Omega 2.169.21)
Application::Run"