problem with nk 6600 pls help

hi
i transfered a .sis file using my infrared port to my phone. it was a theme and the name is yobai.sis. the theme never worked so i uninstalled it. now the main theme file that shows up as a message when u beam it, is not getting deleted...it says software in use. i tried removing the mmc but then too it dosent work. pls help me. i guess my phone is running slow due to this..
thanks :-?

Use FExplorer or SeleQ and locate through:

C:/system/mail/
Go through first folder
Look through each folder ranging from a~z and 1~9
If you see another folder under it, go into it and delete the *.sis file

Then you should be able to delete the message in your Inbox