Is it possible somehow to make sure that nothing gets written on the bad sectors. My 80 GB HDD has some and whenever I download something on it I get the error while it reading it or trying to copy it.
If you like your data, get a new drive now. Windows will do its best to mark any bad sectors and not use them, but that is just a cover-up for a drive that has a high chance of failure now. Re-installing or reformatting anything on the drive will not fix the fact that it has issues. Many drive issue are physical in nature and can't be fixed by a format.