I've been having problem at work for around 6 months that I wrote off as user error and now I don't think so. It acts as a virus but virus scans are good. We have .xls files that are created by copy/paste from other files with some manual entry. We ran Excel 97 with all fixes and patches and now run Excel 2003. Problem occurred with both programs. We tried it on another machine not networked running excel XP and same problem. No macros, no links, just BASIC files created from many many other sources to use for mail merge. Saving works fine. But upon closing and reopening, cells have moved within their rows, Some cells are blank when they weren't before. No garbage. One co-worker mentioned that there was, at one time, the macro enable/disable box upon opening but not now and not with all files. When I discovered that, I checked the macro bosx and there weren't any macros. I have tried saving as .txt with tab delimited and then opening back into excel and saving as .xls but problem persists. What to do?