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Some time it might be a corrupt installation might create this issue.

Make sure you remove the failed updates completely from the 'Programs and Features' and then try to perform Windows Update.
...

This requires editing the registry and change the following key :
* HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows \ WindowsUpdate \ AU \ NoAutoUpdate (put 0)
* HKEY_LOCAL_MACHINE \...

Open regedit
Go to HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer
Create the DWORD value DesktopProcess and give it the value 1. 0 is the default (the processes are...

Here I would like to share the following method based on my research: You can click Start , click Control Panel and click Clock, Language, and Region , click Date and Time , click Change time zone,...

scan ur registry, munally sacn ur pc for some virus like this
Go to start menu
click on RUN tab
Type cmd
type dir/ah/w
check if there is file name like autorun.inf, .exe files which are...

restore ur pc as Macarenas said

repair it from windows seven cd

Try to restore ur system to early point , or repair it from win7 cd,use some registry cleaner (reginout) that may fix ur problem

go to ur system restore point, some bad installation had been done on ur pc , try registry cleaner that would work for u (reginout) or try this
1. Turn on your computer into Safe Mode by pressing...

click on start , open run menu type msconfig press enter
here select start items tab and deselect the unwanted programs at start up
u can use software like reginout that has an option of start up...

after doing the things explain by alfa also clean registry key
u can use any registry cleaner i have use reginout that worked for me

uninstall the IE and clean up ur registry use reginout