'Un-sis'. repackages the theme,then you can manually drop it into your themes folder via mass storage/data transfer.This then bypasses installation,certificate problems and that horrible problem of themes disapeering!

1. Install and open unsis 2. choose "Open SIS" on bottom left 3. choose the theme you want to reinstall 4. click on "Extract" 5. few seconds (some times more ) it'll be "Completed" 6. you can now close the program 7. go into installation folder (usually C:/Unsis) 8. there should be e a folder called "Temp" 9. inside you should find "private"-> "10207114"-> "import"-> "some folders (just one ifyou extracted just one theme) with different names (numbers and letters in most of cases)" 10. go inside the folders and search the one of the theme you are intereted, there'll be 4 files: a ) NameOfTheFolder.ini b ) NameOfTheTheme.mbm c ) NameOfTheTheme.mif d ) NameOfTheTheme.skn 11. ok? now, don't close this folder and connect phone to pc using the usb cable or use a card reader12. choose "mass storage" or ''data transfer''. Note: you can also insert memory card into a memory card reader 13. find the folder called "private" . If you don't see it, you need to choose the visualization of hidden files and folders 14. in the "private" fodler, find "10207114" folder and then "import" folder 15. in "import" there are your themes, here you should find the themes you installed into memory card 16. don't close this folder and come back to the folder where you exctracted the theme with unsis 17. just click "back" so you can see your folder selected into the "import" folder 18. choose all the folder and select "copy" 19. go back to the "import" folder into the memory 20. right click and make "paste" 21. here we are, now your theme is in the memory