mkshell

I got the message Health Error with the red bar on Start/Stop Count 100,902 and yellow bars on: Reallocated Sectors Count 1,414 Current Pending Sector Count 40,531 Uncorrectable Sector Count 40,531 Can anyone tell me what this means? I have used Malwarebytes, scanned with Avira Antivirus (Free versions), Piriform CCleaner, and Windows Malware Removal tool. Any suggestions would be helpful.