Check your "Start in" setting under the TWS icon's properties. Make sure it says "C:\Jts". It sounds like it can't find the jar file because it's running from a different directory.
I have figured out what is wrong ,the IB tws 882 conflicts with antivirus software.After I uninstalled the kapersky,everything is ok.but the problem still remains,I could not install the antivirus software.
Then you need to either: 1. Set kapersky to ignore the TWS directory (most av's can ignore specific files/directories). 2. Install AVG, Antivir (both free) or Nod32 instead.