The application install OSX mountain lion cancelled restart

Hi,
I am hoping someone may be able to throw light on this problem. I have a 10.6.8 installed on my iMac and downloaded the latest mountain lion from the app store.
When it attempts to auto restart, it tells me it can't, because the very application I'm trying to upload is preventing the restart, even though I clicked the 'close applications' button.
I have googled this and not come up against an answer to this issue.
I am not very computer literate and have no idea what I should do?
Is there anyone out there who has experience of this and knows what to do when this happens.. and even why this happens?
Thank you in advance.

Read
https://discussions.apple.com/message/15659267#15659267

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