Personal info hijacked, is there any way to tell ?

I have done some banking online and today I encountered what could be a very big problem. When I logged into my account, the bill company account I was looking to pay, was not listed and instead, there was a different account number with the same company. Is it possible someone was able to get my account info from my computer and add their account to pay off mine? There was no $ payed to the account, but I am not sure how that account appeared, and mine disappeared. I ran AD-aware after this in hopes of finding if there was anything hidden. It was able to find 1 critical object but froze up after the scan was complete. I was unable to do anything so I restarted my computer and re-did the scan. This time it found nothing. I then went into Norton, not really knowing what to look for and came across some entries like this:

Details: NIS is protecting your connection to a newly detected network on adapter "ULi PCI Fast Ethernet Controller - Packet Scheduler Miniport" (IP address: 169.254.119.94).

(IP address: 142.161.52.93).
(IP address: 142.161.52.235).
Those are just 3 examples. The message is always the same, but the IP's change. What is this and is this something I should be worried about? I guess I am basically asking if there is anyway to know if anyone has gained access to my computer and got hold of any info. I am really careful what sites and what I do online, so I am really suprised if something has happened. Any help or tips are appreciated. Thanks