It doesn't matter if the machine has SiSoft SANDRA installed, in my experience. I've tested rigs wherein even a brand new installation of WinXP SP2 (any flavor except for 64-bit) with barely any software on it (just drivers, really) would crash if CoreTemp was running. It's clearly a bug in the program.
The reports of the latest version are good, though, from what I've been reading on the program author's website. The new version, so far, has been tested well, with the crashing bug apparently finally licked.