What's the best lightweight browser for a low-powered netbook?

I have a little netbook running Windows XP and the latest update of Firefox has somehow fouled up and it doesn’t work any more. I need an alternative that’s less of a memory-hog and uses up less hard-drive space. I have IE but I’d rather use something else if possible.

Please don’t suggest Chrome – I’m not prepared to tolerate Google’s privacy policy.

Does anyone know of/use anything else?