Do not use Threeitcoin Old Wallet v1.0.0.0 wallet address start letter "T", it's no longer valid. Kindly upgrade to Threeitcoin Windows Qt v1.0.0.1 from following link.
Please upgrade to new Threeitcoin wallet version 1.0.0.1. Old Threeitcoin qt wallet version 1.0.0.0 is no longer valid. New upgraded wallet version 1.0.0.1 address with start letter "t", old wallet address is with start letter "T" is no longer valid.