Most of the application are automatically launched during startup .You need to wait for a long time after logged in . Your machine might get hanged while trying to launch any application just after you logged in. here we can see how to disable startup programs in windows 7
GOTO -> start -> Type “msconfig” in the search box -> press “Enter”
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Now Click “startup” tab
You can see the startup applications list with check boxes . You can probably uncheck all except antivirus , firewall and IM applications as needed.Click “Apply” and “OK”
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Reboot your PC . Now your pc will be faster than before during startup.