I am based in the UK and my computer clock is set to GMT; I have been making use of the multi clock function of Win7 with a second clock keeping tabs on the time in USA. But since USA went into Summer Time over the weekend, my multi clocks have not adjusted. Does anybody else have the same problem?

Do you have the Automatically adjust clock for Daylight Saving Time option checked?

Thanks for your concern. In answer to your question Yes. Microsoft must have been aware of the problem as in later versions of Windows 7, the problem appears to have been fixed.