With what information is provided I would say that the virus probably infected the .exe file in a manner that the v-scanner had to delete the file to remove the virus. There is also a possible that it renamed/moved the file. I don’t use xp myself but I have a friend that does and I know that he can reset his computer to what was on it at a previous date. I do not know if that is a feature of xp or another program that he has on his computer. If it was me that had this issue I would first try to find the file. I had a similar error message when installing office xp and the link that was put on the desktop was pointing to the wrong file. I found the correct .exe file then went into the properties of the link and corrected it. If you cannot find the correct .exe file then re-installing the program should resolve the issue. However, you may want to backup any information with the program that you do not want to lose.