I use online banking and also feel uneasy. Thing is if you don't do online banking due to these threats, then you don't do online buying or online corresponding or use any security sites for buying online. Seems if you give in to these thieves then the internet should not be for you. Thieves come in all forms not just the internet.
Have been reading the post you and birksy are invloved in. Have posted twice but both without response and not even a trial of Open Dns. So be it. It certainly looks as your ISP is at fault that's why the last suggestion of OD. If ,however, it's malware, and I seriously doubt it, then a reinstall or the wonderful Acronis backup is the next thing? Personally wouldn't take such crap for so long as you two have and would have changed ISP long ago, IF it's their fault.
with anything other than their normal login information is just asking for trouble. Every bank on the planet with an online banking facility endlessly repeats the mantra 'we will never ask you for other information, either by email or online'.
Why anyone would readily provide their social security number to an online banking site is beyond me.