Listbox scrolling problem

I am using visual studio 2010.
I develop MFC dialog based application ,
in that i used listbox control.

listbox contain items more than 70000,
when i run this application i am not able to scroll all the items smoothly.

scrolling problem only occur if i run this application in windows7 ,
it run successfully in XP.

if i set the properties as :

Project properties > configuration properties > Linker > Manifest File > Generate Manifest
option to No(\Manifest)

than scrolling problem is solved.

if that option is set to Yes(\Manifest) than scrolling problem is occur in listbox.

Please help me to solve this problem.

Thanx and Regards,
Nilesh