problem after installing

[toyotaTRD]

SMF Version: SMF 1.1 RC2
i just installed smf 1.1 RC2 yesterday on my site and everything was ok. Today I wanted to start creating the structure of the forum (categories,boards) and I saw that when i was clicking on a topic a 404 not found was appearing. any suggestions please ?

[redone]

The error generally means you are missing some files. Go ahead and check that all the files are uploaded.

Also, posting a link to the error you are getting will help identify the file or files you are missing.

[toyotaTRD]

here it is : http://www.sellades.com/selforum/index.php/topic,1.0.html [nofollow] 

i'll try to find if anything is missing.