It will eventually load but perhaps there are so many entries it is having difficulty doing so. I have no idea what operating system this is but it is possible to empty the Quarantine folder using another method.
First open SecurityCenter and go to Navigation > General Settings and Alerts and open Access Protection and disable that.
Then enable View Hidden Files and Folders in Windows Explorer (any internal Windows page) Tools/Folder Options/View
Go to C:\ProgramData\McAfee\VirusScan\Quarantine and click Edit/Select All
Click Shift and Delete simultaneously and the folder should empty.
Take care to delete only the contents of that folder, not the folder itself.
Re-enable Access Protection as mentioned above and click Apply and then exit SecurityCenter.
Those instructions are for Vista/Windows 7/8/8.1.
For XP the folder is found at: C:\Documents & Settings\All Users\ApplicationData\McAfee\Virusscan
If that doesn't help, I recommend you run a few extra tools such as Stinger and Malwarebytes Free, see the last link in my signature below.
If that doesn't improve matters we'll have to think of something else.
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