Comment XAMPP (Score 1) 386
While it may be modded too low to appear, I haven't seen any comments about XAMPP. I've used it to teach a class on MySQL/PHP for several years, but it's just as good for simple HTML/CSS/Javascript. You can get it at http://www.apachefriends.org/en/xampp.html, and simply unzip it to the directory of your choice. The tone of the OP sounded like the company didn't mind programming being done during slow periods, but rather that they didn't want to violate their security policy by allowing someone to install software as local admin. Makes perfect sense to me. Many companies forbid bringing in personal computing equipment for similar reasons.