Make locking/writing to MBR optional .

Some friendly remarks towards the developer...

Make locking (or writing to) the MBR optional.

Writing/locking the MBR can be hazardous.
Programs such as Acronis need to access it too,when using F12 to launch restore.
Some pre-installed windows even have a manufacturer's restore partition that needs to be accessed at boot time (when needed).

Another suggestion would be to make antivirus protection optional,to preserve system resources.

Plus it would be nice if Returnil had its own sandboxing feature to test-run or launch separate programs.If not even Returnil's virtual windows can be screwed up at any time.

My 2 cents anyway.

Btw I had to exclude four false positives:
Superlauncher - shellknl.exe virus
Maple Professional maple.exe security risk
BOOKROOM\UNINS000.EXE troyan
LEKUSOFT\LEKUSOFT DVD RIPPER\UNINS000.EXE troyan
(all being former giveaways)