It very much depends on how complicated the website is, what it's been done in an what you need to do with it.
If it's a simple html site and you only need to make simple changes, then a good text editor is probably all you need. I recommend pspad which is like notepad but with extras to make html a little easier to read and it has a preview button. If it was done in FP, then it's likely to be ugly html. I'd start with pspad and delete as much as you can.
http://www.pspad.com/en/download.phpIf you want a wysiwyg, then Kompozer is pretty good:
http://www.kompozer.net/On the other hand, if it's all in asp then you're best off with Visual Studio .NET
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