New
#11
I had a similar problem with an Intel 915 chipset -- uses XPDM driver, which works OK in Win7, but no Aero -- period.
You didn't ask but if you're thinking about upgrading to Win8, you need to know that MS removed support for XPDM drivers from Win8, so you will then be stuck with using the default Basic display driver -- which, since there is no Aero in Win8 anyway, is not a big loss, but any other features (like virtual desktop) that came with the 855 driver won't be there in Win8.