Since no one has the same PC that can't be answered for your machine.
As to security, it's better than compared to "stock" IE 6. But given it's the prime target for exploit (all versions) then security is a forgone conclusion.
Don't use it unless you can recover and kick the spyware out (again and again.)
Bob
I'm still holding back using IE 7. Have been reading mixed reviews about it. The program interface and new features seem to be worthwhile switching to. My main concerns are security, with regards to viruses and stuff, web page downloading speed. Appreciate opinions and feedback.

Chowhound
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