My preferred antimalware program is Malwarebytes Antimalware. A free but very effective program. It detects things that others don't. That said, no one antimalware program can detect them all. I have around 8 different ones on my computer and 4 different virus scanners (but only one active otherwise they can cause issues). Every few weeks I run them all. If I think I have something that nothing is picking up I run them all in safe mode.
There is another one that I use from time to time called Rogue Killer, but you have to know what you are doing with that one, else you could delete stuff that shouldn't be deleted and wreck the computer. Not advisable for the average user.
A couple of good ones just for general junk clean up, Wise Registry Cleaner and Wise Disk Cleaner (far and away better than Carp Cleaner). Most of the time registry cleaners are only needed if you delete things (gets rid of the fragments that don't delete when you delete photos or programs), but it still helps general performance if run every few weeks as a matter of course. Neither of those programs are antimalware, but good to have on board as part of general maintenance.
OP, I would suggest downloading and running the ones I mentioned (except Rogue Killer) and also the one that PJ mentioned (you can never have too many!). It sounds to me like you have something on your computer that is stealing your information. Until you work out if you have or not, change all your passwords on your phone with the phone disconnected from the home network. Banking, eBay, PayPal etc. Don't use any passworded sites on your computer until you are happy that you don't have something on there.
There is a particularly nasty virus that has been getting around for the last few months called Poweliks. Usually caught by clicking links in emails, but there have been some reported cases of people getting it from websites. It's a very malcious virus that sends all your personal stuff to somewhere in Russia. They can see absolutely everything you do, including messages you leave in this forum and any other sites you have visited. A quick check to have some idea if you might have that one without a scan, open up task manager (right click on task bar and select task manager).
If you use Windows 7 or earlier, select the processes tab and click to show all processes. If you use Windows 8, select the second last tab (can't remember what it's called!). Look for a process called dllhost and/or dllhost*32. If you have multiple instances of that and they are using a lot of CPU (15 or over), then that's what the issue is. It's hard to get rid of, but it can be done.
Good luck! I hope you can get to the bottom of it. Also a good suggestion about only having an empty Visa debit card attached to your account too.
