Search module doesn't work - reinstall?

The search module on my website worked fined in the beginning. However my testsite was installed on a server-subdirectorie (www.mysite.com/mambo)

After a while i moved it tot the main directory (www.mysite.com) and changed all the setting (e.g. in configuration file) i could imagine to make everything work.

Went surprisingly well, but now i see my search-function doesn't work. Actually it works, but for every searchword i enter i get the same mention "no results found".

I'm not sure if this problem is originated by the moving from sub- tot maindirectory, but it's the only thing i can imagen.

Does anybody recognise this? I tried to completally re-install the search-module, but i don't seem to find the files to do so, as the search is a core element of mambo.