Sounds like some application is launching when you connect to the Internet and it wants to read a file called data1.dat. Is that the entire error message? I have seen Data1.dat referenced as part of a keylogger spyware app., but it could just as easily be a legitmate file. I suggest you do a thorough spyware and virus scan to start. Try searching the entire registry for data1.dat and see if it is referenced and by what application. Also check the event viewer for any reference to the error in the application or system logs for a possible clue.
Just go to the Daniweb Security forum, read all the sticky posts at the top of the forum for info on what to do next and then post in that forum for help with removal issues. You're already at the right place. :)
ok thanks Bentkey.like i said,im new to all this but im learning. im not afraid to push buttons or open things up,of course thats how i got into this mess haha. 5 months ago i couldnt even turn on a computer. its given me a few more grey hairs, but it keeps me occupied