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I have downloaded it onto my windows pc 3 separate times and each time it goes to start the program it shows the bitcoin wallet "loading addresses", then it's "loading block index" then my computer makes a noise and I receive this: error loading blkindex.dat. I click OK and it disappears with no options on how to fix.

I'm not very computer savvy. Please help.

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Close the client, go to C:\Users\(Your Username)\AppData\Roaming\Bitcoin and delete everything in the folder except for wallet.dat - do not delete wallet.dat under any circumstances (and empty your Recycle Bin), then restart the client. Somehow your block index file became corrupted.

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Do not delete your wallet! – David Schwartz Mar 27 '12 at 23:23
You can get a copy of the blockchain from – Chris Moore Mar 28 '12 at 0:58
Thank you! it worked =) – Rachel Mar 28 '12 at 3:23
@BinaryMage I agree that in the case of this one question it sounds like the user had an empty wallet, but in the interest of providing good advice to future readers of this question for whom the situation might be somewhat different, I've edited in a warning re:wallet.dat. Good answer, though! – David Perry Mar 30 '12 at 16:39
We only need to delete blkindex.dat right? Why do we need to delete the other files? – Pacerier Jun 15 '12 at 19:34

I just had to delete blkindex.dat. It's a little painful since you have to re-download that ~2GB file, but it worked for me.

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