Okay so I've been doing some searching and just bought an iphone through ebay:

Now I'm worried about which itunes to install onto my PC (windows XP). I've read through some threads and hear alot of problems with 7.4.2, but some say that 7.4.1 works fine, especially if your phone is version 1.02 (which mine claims to be on ebay). But looking at what the seller wrote on his description, saying that "iTunes 4.7 and later is rumored to cause some modifications to the iPhone and is not recommended", therefore which exact version is safe for me to use?