Run HijackThis again, and check the following entry:
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - (no file)
Close all other windows except HijackThis and press "Fix Checked".
For the Orange, since you're unsure, we can just check it through Jotti's Online Scanner (
Online malware scan)
C:\PROGRAM FILES\orange4\
orange4.dll
Upload the above file for analysis; it make take some time. Copy and paste the results into a Notepad file, then attach it to your next reply.