Dual Boot Works But Drive Letters Don't Match

I took a 1 tb drive and split it into 2 primary partitions. I installed xp on partition c with an image. I installed win 7 on partition d from scratch.

The dual booting works fine. However, in win 7, the drive i installed win 7 on is listed as drive c. The drive i installed the xp image on is listed as drive d. The files for each, however, are listed on the original drive letters (xp on c and win 7 on d). It really gets confusing with i install a program in win 7. It claims it's installing the program on drive c but it's actually installing it on drive d.

Any idea what happened, or how to correct this? I've set up systems to dual boot in the past and never ran into this problem.

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