What is I/O Error?

Where does you run or install the bit defender, because if you install it under your normal user and not in root, all files that are not accessible by your normal user, will be counted as an i/o error.

hope it helps

Ok what??

Friend eric...

i think my browser is disabling some pictures, yah your right its philippines, i am proud to be a filipino,

My guess is that you ran the scanner as a normal user, but asked it to scan the entire system. There are a number of directories and files that are not readable by non-root users, so they would likely give you an i/o error when bitdefender tries to read them.