Sorry to intervine. Do not follow the following instructions.
Now navigate to this folder
C:\Documents and Settings\Debda\Application Data\Mozilla\Profiles\default\xq85bfr6.slt\Mail\mail.uk2.net\Inbox/
and delete everything in there.
Do the same in this folder
C:\Documents and Settings\Debda\Application Data\Qualcomm\Eudora\attach