Gmail can't reply, forward at IE8

Hello,

I used gmail at IE8, come out mail and can read it. But, when i want to reply or forward this mail, click these buttom. Although can click these buttom, didn't come out for reply or forward. Only show as below :

" QUOTE "

" Internet Explorer has encountered a problem with an add-on and need to close.

The following add-on was running when this problem occured:

File : Rash10b.ocx
Company Name : Adobe Systems Incorporated
Description : Adobe Flash Player "

" UNQUOTE "

Awaiting your reply with thanks.