Put the 1TB in the enclosure of the 250Gb, connect it to the laptop and clone the 160gb to the 1TB with acronis test version. Take the 1TB out of the enclosure and into the laptop and try to boot. If that works, create a new partition on the rest of the 1TB and format it. Put the 250GB back in the enclosure and and copy the entire content to the newly created partition with win explorer. Take care, that the new partition gets the same drive letter, the 250GB had before. You can change drive letters in disk management if needed.