I cant update the virus signature data base list

I have windows 7 64bit and the nod32 antivirus version 5.
Now in the last few hours my last signature databse is from the 24/7/2012 this happened after i did a restore point in my windows . Now im getting a warning in the program it self on the top right corner there is a sign "!" and when i click on it i see: Maximum protection is not ensured. Virus signature data base is out of date.

But if im
in the program in the main window in the tab of UPDATE i see : update is not necessary the virus signature data base is up to date.

So im confused here. The last update date i see is 24/07/2012 on the right top corner i have a warning message to update the databe virus signature but in the program it self it say that update is not necessary.

And if im clicking on update to make a new update its working and working and nothing happen untill it stop.

What should i do ?

 

It's possible that system restore may have upset the update module. First thing to try is clearing the update cache and restarting the computer. If that fails, uninstall and reinstall NOD32.