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Agree with: Hiren's BootCD, 7-Zip, FileZilla.

Diagree with: Microsoft Security Essentials (found it to not be "less resource intensive" on Windows 7), ComboFix (as was infered, this is more a last-resort tool, when you want to take one last stab at cleaning before giving in and re-imaging).

Other recommendations: VNC for remote console management, Cobian backup for a Windows-based backup solution, LibreOffice or OpenOffice for an MS Office substitute.