It's most likely your bitcoin client. To reassure yourself, check out the listing on blockchain.info for the address that is supposed to receive bitcoins.
HiThank you.
The address on blockchaininfo does have my personal long string of letters and numbers.
What do you mean?
The address on the blockchaininfo page is the same as the address in my wallet.
Please could you tell me when the coins will appear in my computer wallets?
Appreciated.