Go to the resident protection settings (by clicking the blue ball icon), select (doubleclick) Standard Shield and check the second page of the following dialog. You probable have "Scan files on open" enabled, maybe even for all files. If it is the case, try to disable it, or limit the number of files to be scanned (put only exe,dll into the corresponding box or something like that). You'll see if it helps.
Also check the "Scan created/modified files" option below.