Vesja, Windows XP 32-bit is limited to 2TB partitions. XP 64-bit, Server 2003 64-bit, Server 2003 RC1, Vista and Server 2008 do not have this restriction when using GUID partition table (GPT). To my knowledge, Microsoft has no plans to update 32-bit XP to use GPT, so this issue will remain.
paolopoletti, it looks like your issue is related to the MBR partition. MBR partitions are a maximum of 2TB in size. You'll need to delete the partitions, and change the partition map to use GUID Partition Table (GPT) instead of MBR.