Hi Uden,

This error occurs when you click on Mail & More or Download manager on MSN . This errors are random msn9.mailhost or msn1f.mailhost or mailui.dll . This is caused due to corruption in the MSNcore files . to fix this follow the Steps below.

Before you try the steps, you have to sign out of MSN.

For Windows XP:
Note: You must have administrative rights to re-register this file.

Click Start and then click RUN.
in the Open box type the command c:\progra~1\msn\msncorefiles\mailui.dll then click OK.
followed by regsvr32 c:\progra~1\msn\msncorefiles\msnmetal.dll then click Ok

For Windows Vista and Windows 7:
Click Start then in the Search Programs and Files box, type the following exactly.


Thanks,
Nitesh