Error while unpacking program, code 2. Please report to author.
Reinstall your antivirus program such as Spyware Doctor with Antivirus etc. This happne when you perform upadte from Microsoft Windows Update. Update is OK only you have to reinstall your antivirus program so that new update is recogonised by the antivirus program. Unistall anti virus programm from add/remove programs. Go to antivirus program's web site (such as pctools.com for spyware doctor) download antivirus software and install (before uninstall write down your product licence by clicking on antivirus program help menu about so that if you have it if new downloaded softwares asks it)
Peform smart update after downloading and your error is gone. Hope it help. You dont have to install and reinstall antivirus whenever you perform windows update. It happnes once in while. So dont worry you dont have virus. Error is due to misunderstanding between programs Hope it help.