Why can’t I uninstall some software from my PC after a virus was removed?

nikita talukder April 27, 2013
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I’m using windows 7 and Kaspersky as anti-virus. I’ve already fully scanned my PC last week and there is no virus now. Though its completely alright I don’t know why I can’t uninstall some programs from my PC. And I just found a few minutes ago that I can’t even change my PC’s password. What should I do? Should I reformat my PC again?
*(I formatted my PC on February)

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