Bitcoin Core 0.21 - error opening block database

[bob123]

I use Windows 7.

If you are using core for development, i guess that's fine.

But if you intend to store money on your PC, please don't use Win 7 anymore. It is outdated, vulnerable and won't get any security updates.
It is not just missing lots of security features which are available in Win 10, but it has known vulnerabilities too.

Do yourself a favor and update to Win 10.

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[Raini1110]

I use Windows 7.

If you are using core for development, i guess that's fine.

But if you intend to store money on your PC, please don't use Win 7 anymore. It is outdated, vulnerable and won't get any security updates.
It is not just missing lots of security features which are available in Win 10, but it has known vulnerabilities too.

Do yourself a favor and update to Win 10.

I am aware of this.

How do I get rid of the error?

Is the entire BTC blockchain from BitcoinQT available for download as a ZIP?

Can I install Win 10 over Win 7 without losing my data?

I have ordered a new laptop but it takes a long time with the delivery.

[bob123]

How do I get rid of the error?

As far as i can see in this thread, you fixed that problem already but it happened again due to another poweroutage?
You basically just need to do the same again (starting core with the reindex parameter). You probably just were in the wrong directory, that's why you were told there is no application.

Is the entire BTC blockchain from BitcoinQT available for download as a ZIP?

It is, but downloading the blockchain usually isn't the bottleneck. Processing is the bottleneck. So this wouldn't change much.
And i would highly recommend to build the chainstate yourself and to not trust on others data.

Can I install Win 10 over Win 7 without losing my data?

I am not sure about this since i'm not using windows, but i believe there is an "upgrade" option which keeps the data.
Even if there is not, you could just copy all of your data (blocks, chainstate, wallet, etc..) to a hard drive and then copy it back after installing Win 10. Then you don't need to downloaded and process the whole blockchain again.

[Raini1110]

How do I get rid of the error?

As far as i can see in this thread, you fixed that problem already but it happened again due to another poweroutage?
You basically just need to do the same again (starting core with the reindex parameter). You probably just were in the wrong directory, that's why you were told there is no application.

Is the entire BTC blockchain from BitcoinQT available for download as a ZIP?

It is, but downloading the blockchain usually isn't the bottleneck. Processing is the bottleneck. So this wouldn't change much.
And i would highly recommend to build the chainstate yourself and to not trust on others data.

Can I install Win 10 over Win 7 without losing my data?

I am not sure about this since i'm not using windows, but i believe there is an "upgrade" option which keeps the data.
Even if there is not, you could just copy all of your data (blocks, chainstate, wallet, etc..) to a hard drive and then copy it back after installing Win 10. Then you don't need to downloaded and process the whole blockchain again.

How do I get rid of the error?

Error:
C:\Users\Raini>Bitcoin-qt.exe is not a Reliable WIN32 Application?

[nc50lc]

-snip-

How do I get rid of the error?

Error:
C:\Users\Raini>Bitcoin-qt.exe is not a Reliable WIN32 Application?

Looks like you missed my reply in the first page (post #20) since you only replied to Bob's post.

To expand it, it's showing that your cmd is currently working in "C:\Users\Raini" which is the default cmd directory if you launch it using start or hotkeys.
It should be working in the directory where Bitcoin-qt.exe is located or indicate the absolute path when launching bitcoin-qt.

[Raini1110]

-snip-

How do I get rid of the error?

Error:
C:\Users\Raini>Bitcoin-qt.exe is not a Reliable WIN32 Application?

Looks like you missed my reply in the first page (post #20) since you only replied to Bob's post.

To expand it, it's showing that your cmd is currently working in "C:\Users\Raini" which is the default cmd directory if you launch it using start or hotkeys.
It should be working in the directory where Bitcoin-qt.exe is located or indicate the absolute path when launching bitcoin-qt.

  Thank you very much. I really overlooked it.

C:\User\Raini>cd C:\Programs\Bitcoin

cd C:\Programs\Bitcoin>bitcoin-qt.exe -datadir=E:\Bitcoin -reindex

Thanks for your great help.