Hi!
For php/html/css editing in Windows I recommend either
NetBeans or
Eclipse
For testing:
-
Firebug plugin for FireFox
-
YSlow add-on to Firebug
-
ColorZilla plugin for FireFox
-
MeasureIt plugin for FireFox
-
Web Developer add-on for FireFox
- development tools built into Google Chrome
-
Developer Toolbar for IE