After i reformat my pc i cant open up my yahoo mesenger.pls. help me.?

when im opening my ym it would appear that i be connected to the internet or my proxy setting

After i reformat my pc i cant open up my yahoo mesenger.pls. help me.?
Check whether u have downloaded yahoo messanger properly. If in ur pc there is NORTON ANTIVIRUS 2006 then it won't support latest version of yahoo messanger. U can also switch over to G talk.