Hi
I created a bitcoin wallet once to pay for a service from a site, but i never bought the service and kept the bitcoins. I also very shortly did some mining.
And i changed OS a few times since so i have no files what so ever form then.
So if i don't have a wallet.dat file i have lost that wallet for good ?
//Brian
Which was your btc wallet address and how much did you loose there ?
Can you enlist your wallet address you lost ?
We could try searching on blockchain if still it exists or you should contact the service center of the client you used dear.