|If your words are white and you have a black background, than try this.|
Start - Control Panel - Accessibility Options - Display Tab -
Remove the check mark in the little box for (Use High Contrast) and click APPLY
Accessibility Options is the first Icon.
If that's not your problem than reply back and let us know, so someone
can check further.
If this is a recent change than a System Restore to an earlier date should
fix the problem.
Start - All Programs - Accessories - System Tools - System Restore.