If I understand you right, you have the McAfee home splash window that covers the whole screen ??
Please let us know if you have any problem while opening the main interface of security center .
Additionally, please run Mcafee viortualtechnicians from here : http://mvt.mcafee.com and post me your session id.
Along with your next post, please attach a screen shot of your issue (home splash screen)
McAfee Online Community Moderator