which is better nod32 or F-Secure in virus threat ??

This is false. That was just a help explanation for a past test. "The levels are set for each test by the tester. Products that got the "standard"-level can be understood as products that based on our tests have a good on-demand detection rate of zoo-samples, "advanced" a very good on-demand detection rate and "advanced+" an excellent on-demand detection rate of zoo-samples. Such a classification was also set to the retrospective tests."
As I do not want that peoples give to much importance on minimal differences in percentages, the levels were introduced; levels are generated by groups of detection classes for each single test.

 

May i ask where you "heard" this? It would be good to supply at least a link instead of "I've heard". 4.5 is definitely slower, but it's still a nice anti-virus and i have both versions Btw.

Edit: I just realized you meant 4.5 versus F-Secure, thought you meant 4.5 versus 5.0.