Is this enabled at the Control Panel System utility. On the System utility [Advanced] tab, in the Performance section, click on the [Settings] button. You'll see four radio buttons.
Set as you see fit.
Probably not the best description but here is the problem. On my son's computer (XP,SP2) in either Internet Explorer or Windows Explorer, when he runs his cursor over 'File' or 'Edit' or 'Tools' etc the word does not highlight. On my computer when I do this it has a dark grey background. Both computers have the 'silver' setting. On my computer at work when I do this the area around the word raises up but doesn't change colour. Anyone know how I can change the setting on my son's computer so the background around the word is darker?