Is there some way to test to see if my computer has been hacked?

Can someone tell me how I can test my computer to determine if it has or is being hacked?
Thanks

lindafromwhittier wrote:
Dave
...what is filevault?  And now that you know the firewall was off, does that mean it could have been hacked?
Not Dave, but I'll try to give you some answers.
In System Preferences->Security click on the "?" in the lower left hand corner to learn how to make your computer more secure.  When you finish doing that type "About FileVault" in the search box in the upper left corner of Mac Help to learn what filevault is.  It has been known to cause issues with backups and if you forget your password there is no way to recover the information in your home folder.  They have revamped this capabiltiy in Lion (FileVault 2) to improve it, but I don't think users have had much of a chance to check it out to see how capable it is.  Since I don't use it I hesitate to comment.
It's slightly more probable that you have been hacked with the firewall off through remote access, but now much. 
Since I already paid for MacKeeper- thinking it was an Apple product, and seeing what is known about their ethics - which does matter to me, can I really get rid of it, thoroughly?
MacKeeper support says that you can completely remove it by dragging it to the trash and answering a question about why you don't want it.  After you do that, the uninstaller is supposed to remove everything.  Users have found that their keychain still contained passwords for mackeeper or zeobit which shouldn't cause any problems.  A user the other day said they searched their hard drive and found three left over files, but I don't think they ran the uninstaller.  Depending on what features you activate you may have to Log out or restart your computer to completely stop the processes running in the background, but the uninstaller should have taken care of that, as well.
If you decide to uninstall it and want a list of the known places to look for files let me know and I'll provide you with the list I have.

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