My system is a home built system, tyan thunder k7 duel AMD board with 1500mp processors, 1gig ram, wildcat 6110 208 meg graphics card, two 120gig hard drives, running windows 2000 pro service pack 3,networked to a puter with abit bx133 board,384 megs ram ,1.2gig celeron processor,elsa gloria DCC graphics card,4 60gig hard drives, running windows xp pro. ChasUGC, I hope this information is helpfull. sorry I didnt think to list it before. I do defrag reg. tho. just once a week. No problems with any other program or files I have. I have also tried to save the theme with diferent names but has no effect. If I open an original it dissapears too. I had about 27 working themes. Now only 4 will open.Buy next week I will have none that work if I don't figure this out. As far as a virus i've scanned and found none.What ever this is it seems to only effect DX Themes.It has happened on the XP machine also but not near as often.lost only 3 themes on the xp. I havent tried uninstalling DX yet but I will and see if that has any effect. That machine never goes on line but i will check for spyware anyway. Thanks for your help ChasUGC.If You can think of anything else,let me know, and I will post back here what happens. Thanks