Not all damage can be undone. If the virus/trojan/pest is gone, the damage can still be there.
I am guessing that some are unaware that removing these pests does not remove the damage.
There, I've written it and hope you can differentiate DAMAGE from a PEST that is still there.
I have a vista home o/s and recently have been attacked with some sort of virus that has changed all my fonts to symbols. It is difficult to even work with the computer because you cannot read anything. I have completed several system restores from the boot up and a few times it has fixed the issue. One one occasion I ran Malwarebytes and Spybot and it got several trojans and registry errors which I corrected. One of these such errors was a "task manager hijack" which I noticed completelty removed the option to open task manager when you hit ctrl alt delete. Now the system restore will no longer fix the issue and I am guessing the virus is deeper than I thought. What now??