I installed microsoft security essentials on my laptop but after almost 1 month it doesn't display to me,interface not there even i don't uninstalled it. and when i was trying to install a new setup,process doesn't completes...

What do you mean by process doesn't complete? What does it do? From that we might be able to give you better help. Does it show any error messages?

Hi, Did you received any error when reinsatlling? Please refer to the following thread: http://social.answers.microsoft.com/Forums/en-US/msestart/thread/29c086a6-eeb0-482a-9634-114def489ceb http://social.answers.microsoft.com/Forums/en-US/msestart/thread/908fad3e-f9fc-4d8a-be83-ae7d3bc48db5 Regards,Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.