[Bitcoin-Qt](http://bitcoin.org/en/download) is the original Bitcoin client and it builds the backbone of the network. However, it downloads and stores the entire history of Bitcoin transactions; depending on the speed of your computer and network connection, the synchronization process can take anywhere from a few hours to a day or more.
Unpack the files into a directory and run bitcoin-qt.exe.
### Need Help?
* See the documentation at the [Bitcoin Wiki](https://en.bitcoin.it/wiki/Main_Page)
for help and more information.
* Ask for help on [#bitcoin](http://webchat.freenode.net?channels=bitcoin) on Freenode. If you don't have an IRC client use [webchat here](http://webchat.freenode.net?channels=bitcoin).
* Ask for help on the [BitcoinTalk](https://bitcointalk.org/) forums.