Win 7 x64, IE9, MSE in my Dimension 9200 and would this system benefit from having the SUPERAntiSpyware free version scan from time to time?

I am sorry if this had been discussed before.

One has to be very careful with one's habit while surfing the net and opening the e-mail attachments, I understand.

I have the Malwarebytes free version as on demand scanning for eventualities.

What about having the SUPERAntiSpyware the free version for scan. Is it over kill as the modern IE 9, Win 7 x64 and MSE are save enough.

Regards