I too have Access Denied problems. Mine show Archive is password protected.
I run Windows XP. I am an administrator.
I have tried disabling all Real Time scans. When I add each back one by one and scan a file that gave me this message, it scans the file. I am not going to take the time to scan each and every file on my computer. This may take days.
I did try to just scan the C drive, Documents and Settings only, with no real time scans running and the reults were it scanned with no problems.
So if the problem lies withing scanning the whole system, I am not going to take the time to scan the whole computer 7 times to figure out which is the culprit, since it takes a good hour or so to complete each time.
I will run the program without real time scans and if that does not work, I will just find some other program that works without so many complications.
I do not use any of these in "real time", but these are also programs I use:
Spybot- Search and Destroy
Malware bytes Antimalware
SuperAnti Spyware
I also use:
CCleaner
SlimCleaner