It is indeed a false positive, and heres a temporary solution until avg fixes it.
Step 1: Turn off "resident shield" in your avg settings. This will prevent avg trying to read the file while you try to register its class. If you dont turn it off you will get "access denied".
Step 2: Go to your start menu and open "run"
Step 3: Type exactly this. regsvr32 %windir%\system32\secdel.dll
Now your done. All should work fine with SFS. Just leave resident shield off until avg puts a fix in place or you will have to do this repeatedly. All of these steps assume you are running XP and you currently have SFS installed. All of these steps may be the same for vista but I dont know because vista is the devil and I dont use it. lol. Also not sure if AVG runs on vista...
