I tried to perform the usual Wednesday update today and the three 'usual' updates downloaded and then I got this message:

"C:\program files\spybot - search and destroy\adv check.dll
The existing file is marked Read-Only.
Check Retry to remove the read-only attribute and try again. Ignore to skip this file, or Abort to cancel installation".

What is going on please? I clicked Retry (not knowing what else to do) and nothing happened. I restarted my computer. I opened S&D again and checked for updates and was told no newer updates available.