Identity Theft

Someone stole my identity today. I got a call at 1PM from a financial institution that suspected that the transaction was fraudulent. The transaction was cancelled when I confirmed that I had not done it, and I immediately went home and changed all my passwords. I want to monitor the activity, but I am afraid of logging back in in case there is a phishing virus on my system. I have reconnected my modem long enough to make this entry, then I will disconnect for a few days.