Without knowing what the error is and what HD has an error it is difficult to give you the best approach.
If someone knows how to re-enable the dismissed warning and that solves this, cool...but
Ignoring HD issues and warnings can result in losing personal data, a PC that will not boot-up, etc.
If it's a SMART warning, you may have a HD fail anytime and all data may be lost.
You should get the HD diagnostic utility from the HD manufacturer's website and use it.
You can also run check disk on all the hard drives. Disk Check
If you run Check Disk on a HD that is ready to fail, it may push it over the edge.
How important is your data and OS/Programs install?