Question Details:

My husbands friend came to our house and used our computer (w/o asking). He caught his friend copying all our files from our documents. My husband has a buisness and keeps everything on the computer. He took the disk and formatted it but copied everything the friend copied first to know what he took.

After the friend left we saw that he has some kind of networking program (he's some kind of hacker). Is it possible to see if he sent the files first to his computer or network?Or even to see what exactly was done on the computer?

Answer:

You can't see what the man did on your computer or what files he copied. It is possible that he installed on your computer some kind of keylogger that spies every move you make on your computer.

You can learn here how to detect and remove such kind of programs.