I suggest Avira or Free-AV
It has a very good on demand scanner and an excellent Resident protector.
To test an antivirus's quality, all you have to do is :
Copy paste the following code into notepad and save in as EICAR.com.
The EICAR test file is known by a few.
I'm proud to be one of them
Also, that's a good sign that Nod32 does not allow you to create the file.
Nod32 is proactive. VERY good antivirus.