I just wanted to install bitcoin-qt on another machine (all others are working fine) but I cannot seem to retrieve the block chain using bitcoin-qt 0.8.6-beta (as downloaded from http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.8.6/bitcoin-0.8.6-win32-setup.exe/download).

I'm running bitcoin-qt (started as as administrator) on Windows 8 using a 3G data connection. After downloading a few thousand blocks the software keeps on quitting with the error "failed to read block". When I restart the software it fetches another thounsand blocks and quits with the same error soon.

Even a full reinstall (I additionally deleted the whole data directory in %APPDATA\Bitcoin) doesn's seem to help. Starting bitcoin-qt with "-reindex" didn't help either. I checked the hd-drive for errors but didn't find any.

What am I dong wrong?

  • As administrator?? Why do people do that? Jan 11, 2014 at 18:07
  • Usually I'm not doing this. I just wanted to prevent answers pointing out that rights problems could be the reason for this behaviour. Jan 12, 2014 at 9:23

1 Answer 1


Start bitcoin-qt in a new command prompt with the flag -reindex after you make sure your 3G provider doesn't block your downloads after a certain threshold.

  • I already tried to reindex. My provider doesn't block traffic (I can tell this as I'm working on the same connection meanwhile - without putting too much load on it). Jan 11, 2014 at 21:29
  • Since you have other computers working fine, one thing you could try is to copy the blocks' files from a working client to the one that throws that exception. You will have to delete in source and then copy the block files, which can be found under: en.bitcoin.it/wiki/Data_directory. You will need to rescan and wait until the new blocks get verified, just like as they had just been received by the network.
    – user11221
    Jan 12, 2014 at 2:30
  • OK, then I'll copy the block files from another machine when I return and get access to it. I just thought I set up bitcoin "quickly" (usually it takes about a night to be done) but in this case it didn't seem to work. Strange behaviour nevertheless... Jan 12, 2014 at 9:25

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