Adaware and Spybot do the same thing but often one will catch something the other didn't so I use both.
AVG is the only actual antivirus you have.
Spyware blaster protects against hijacking, I prefer spyware guard (from the same group).
Hijack this is only used as a diagnostic and cleaner for hijacks, keep it.
Zone Alarm is your firewall.
I'm not familiar with CWShredder.
\"The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.\" Friedrich Nietzsche