I am having exactly the same problem but I have SP3 installed.
The issue only appeared today and was working at some point in the last 3
weeks as I've successfully created full-text indexes in that time.
I've not made any alterations to the SQL Server installation in that time.
In fact, the only thing I've installed recently is Microsoft Security
Essentials.
Have there been any automatic updates in that time?
I'm downloading SP3 again and will try reinstalling it, see if that works.
url:http://www.ureader.com/msg/1147857.aspx
>> Stay informed about: Error with Full-Text Indexing Wizard - sql server 2005