user43063: I downloaded Bitcoin Core 0.13.1. After starting the program it gives me an error:

2016-11-09 18:38:17 IO error:
  C:\Users\PC\AppData\Roaming\Bitcoin\chainstate\304129.ldb: Impossibile
  eseguire la richiesta a causa di un errore di dispositivo I/O.
  2016-11-09 18:38:17 *** System error while flushing: Database I/O
  error

The error seems to translate to English as "Failed to execute request due to a I/O device error."

user19097: You may want to check the state of your disk to make sure there are no issues, also, that your data directory has the correct permissions set.
I hope this helps! :)

user5406: 
Impossibile eseguire la richiesta a causa di un errore di dispositivo I/O.

Apparently means something along the lines of: 
"The request could not be performed because of an I/O device error."
There is likely an issue with your hard disk. You should create a backup of your wallet.dat, then run disk diagnostics, and perhaps replace the disk in the near future if the diagnostics indicate a problem.

43063: <p>I downloaded Bitcoin Core 0.13.1. After starting the program it gives me an error:</p>

<blockquote>
  <p>2016-11-09 18:38:17 IO error:<br>
  C:\Users\PC\AppData\Roaming\Bitcoin\chainstate\304129.ldb: Impossibile
  eseguire la richiesta a causa di un errore di dispositivo I/O.<br>
  2016-11-09 18:38:17 *** System error while flushing: Database I/O
  error</p>
</blockquote>

<p>The error seems to translate to English as "Failed to execute request due to a I/O device error."</p>
 19097: <p>You may want to <a href="https://github.com/bitcoin/bitcoin/issues/7248" rel="nofollow noreferrer">check the state of your disk to make sure there are no issues</a>, also, <a href="https://bitcointalk.org/index.php?topic=1362047.0" rel="nofollow noreferrer">that your data directory has the correct permissions set</a>.</p>

<p>I hope this helps! :)</p>
 5406: <blockquote>
  <p>Impossibile eseguire la richiesta a causa di un errore di dispositivo I/O.</p>
</blockquote>

<p>Apparently means something along the lines of: 
"The request could not be performed because of an I/O device error."</p>

<p>There is likely an issue with your hard disk. You should create a backup of your <code>wallet.dat</code>, then run disk diagnostics, and perhaps replace the disk in the near future if the diagnostics indicate a problem.</p>
