I ordered Norton Internet Security, and within 2 weeks (with no other online purchases) started receiving several unauthorized charges from things like MYCSHELP, EPOCH, and PMTZONE.

I also found this news article http://news.cnet.com/8301-1009_3-10208865-83.html

Dated 31 March 2009, the article says, "Symantec is investigating allegations that a call center in India leaked credit card numbers of its customers to someone who then sold them to BBC News reporters posing as criminals.

The security company has informed U.K. privacy authorities and attorneys general and officials in eight U.S. states and Puerto Rico of the allegations that three U.K. customers had credit card information leaked and that about 200 U.S. customers may have been affected because of interactions with the call center, Symantec spokesman Cris Paden said Tuesday.

"We nailed it down to one agent at the call center" who handled the Symantec customers, he said. That agent was put on administrative leave pending the outcome of the investigation, Paden added. ..."

There's more, but you get the gist.

Could this be causing some of your problems?