I use windows xpI installed Microsoft Security Essential ( MSE) succefully for some time and I was so happy with it. When I tried to upgrade it I failed so I uninstalled it . When I tried to reinstall it , it refused to. So I had to use Microsoft Fix it Center program to fix that problem , surprisely it removed the (MSE) completely from my system. Now I am not able to install (MSE) any more giving me ( error 0x8004ff07 ) 1 person needs an answerI do too

Hi Mrs Salwa Alfadaly,Here’s a post which contains steps to fix this issue. Try the steps listed in order:0x8004FF07 - Failed Upgrade - Can't uninstall/ReinstallIf that does not help, post your query in Microsoft Security Essentials Forums for better assistance on this issue.Regards,Divya R – Microsoft Support.Visit our Microsoft Answers Feedback Forum and let us know what you think.