SDK 2.1 installer hanging

Ive been trying to Install the CUDA SDK (already installed the driver and toolkit) but all it does is hang on the “NVIDIA CUDA SDK is configuring your new software installation”. Hasn’t moved from there for a good half hour, tried restarting and re downloading it, doesnt seem to help.

The werid thing is that the toolkit did the same thing but I left it for a while and it finally installed.

Vista 64bit Ultimate.

Thanks. Beta.

EDIT:.

Just finished installing, took over a hour, close please.