back to 3.0 single user, still adding /blog

Hello,

I tried to activate the multiblog functions on my WP 3.0.1 (in a subfolder). It was a bit buggy ; so I did the reverse operation and went back to the single site version.
Now my permalinks are false, with the /blog in every URL.

Looking at the DB, I’ve still got a wp_blogs table. Is it the reason of my false permalinks ? If yes, can I just delete this table, continuing using wp_site alone ?

Thanks for the answer ; my ranking is falling down
cheers