no need to reinstall at the moment. If you installed all your drivers the same way you did with the beta, try running your windows experience index test again. Go Start > Right-Click Computer > then click Properties. Where it says Windows Experience Index, click on it and run the test. Windows needs this score to determine if it can turn aero on.
If that doesnt work, press Start > type device > go Device Manager. Go down to 'Display Adapters' and right click on whats there and select update driver. Restart, then rerun the WEI test.
If that doesn't work, go to the dell site and search for inspiron 1721. Then go to the support section for it and download the Vista drivers for your graphics card and chipset. (While your there u...