What just happened?

[betam4x]

Recently reinstalled Bitcoin on my Windows 8 machine after having it uninstalled for over a year.  Had 2.xx bitcoins in my wallet.  Found a site called Satoshi dice and started playing around with it.  Suddenly I notice a big transaction from my account.  Can someone help me figure this out?  Don't think i have any viruses or anything, Did install litecoin, i0coin, namecoin, and bitcoin from their official sources?  See below:

http://blockexplorer.com/tx/a2aceb766e4083306b83f8db35ee30b9ff9e154708d9146b35d25f976c545541

[DannyHamilton]

Are the coins still in your wallet, or does your bitcoin wallet show that your balance has dropped by this amount?

[betam4x]

They are still in my wallet, but the blockchain is still downloading.

[runlinux]

You spend all the amount owned in an address when you spend some. The rest is returned as "change" to your wallet.

[Raoul Duke]

That transaction is your change. The 2.58712248 BTC are still on your wallet and should show up as available balance for you to spend. The address where they were sent is a change address, so you won't see it on your bitcoin client, but it is indeed on your wallet.dat.

In fact it's the same transaction as the one where you sent 0.01 to SatoshiDice, just another output.
You can see it better on the link below.

http://blockchain.info/tx-index/18494141/a2aceb766e4083306b83f8db35ee30b9ff9e154708d9146b35d25f976c545541?show_adv=false

[betam4x]

Thanks!