I have a Dell P.C.with windows XP. About a month ago, a pop-up came up indicating it was from microsoft winfixer and that there were problems with my computer which it could fix. I went ahead and went through the process. Now the computer is slow, there are problems logging onto simple programs such as Word and the computer locks up. What can I do. I did some research and found out this is a virus ?? Is this true and how could I fix it.