Probably unknown NewHeur_PE virus

Hello!

Today I was scanning my PC with NOD32 (PC didn't want to turn off and I thought that it might be a virus/malware/...). So, NOD32 reported, that there is probably unknown NewHeur_PE virus - it found two files (A0029836.exe and A0031203.exe) in System Volume Information map (and I can't even open this map, it says that access is denied). There was no possibility to delete the files with NOD32, neither to put them to quarantine. The only thing that I could do, was to "leave" the thread and continue with scanning.

What now?

Thank you very much for your help.