Hi felixml, at this point there are several variations to IE6.0. Depends on which Hotfixes you have applied or if you applied SP1 etc. Some of the Hotfixes caused more problems than they solved. Or in some ways fixed one thing, but broke something else in the process. It could be that you have a combination of things going on now which you may not be able to get out of, without doing a reinstall.
I had to reinstall once some time ago to get out of some IE6.0 issues. If you do a reinstall now then I would only use the newest changes that are needed, and not try the old stuff that has been superseded by now.