I would recommend that you download CWShredder again and run it after booting.
Then update AD-Aware and SpyBot and do full scans with them. Set AD-Aware to do a
custom scan and do a full in-depth scan. Then do a full Virus scan.
You may have been hit with a newer version of that hijack program, so download
a new copy of CWshredder.exe
every evening and run it. They update the program often and newer versions may
pickup some things todays version missed.