Windows 7 Is Not Detecting Other Partitions On Same Hard Drive

I installed Windows 7 64-bit on my computer which has only 1 hard drive (640GB). I partitioned it using XP to have 4 partitions: 1) XP Partition 2) Linux Partition 3) Linux Swap 4) Windows 7.The problem is Windows 7 cannot detect any partition besides it's own partition, so I cannot access any of my data from the other partitions (XP and ubuntu --- I don't care about ubuntu but I need the data on the XP partition). I know the other partitions exist since I can access XP still, and I believe XP can detect all 4 partitions.I went to start->menu then searched for partition and selected "Create and format hard disk partitions" and it actually detected all the partitions. The problem was the other partitions did not have drive letters associated with them.So I just right clicked and changed the drive letters.