Giovanni,
your question does not have a simple yes or no answer. There are so many other factors to PCI Compliance that it would be misleading to answer yes or no to the question.
The following from Office Guy is the closest to a simple yes or no answer you can get on the subject:
if you put PowerStore on a PCI compliant server the answer would be yes. 
That is to say the only way the PowerStore code would pass PCI compliance is to host the PowerStore code in a PCI compliant environment.
That would hold true for *any* shopping cart software.
