There's another way to look at this problem. If you are trying to keep your Word docs from your XP system to look the same when you transfer them to your Windows 7 system, here's what you can do:
Open a Word document, click the Windows Orb, go to Word Options, Advanced, scroll down to the very bottom of the screen to "Compatibility Options for" and select: "All new documents."
Then, under: "Lay out this document as if created in" open the drop-down menu and select: Microsoft Word 2003" (or if that doesn't help, the next time, try "Custom").
Then, if you want to preserve your old format whenever copying and pasting, in that same Advanced section scroll back up to the “Cut, Copy and Paste” section. There you will see 4 windows: "Pasting within the same document," "Pasting between documents," "Pasting between documents when style definitions conflict," and "Pasting from other programs." For all of them, select: "Keep source formatting (default)."
PS You might also need to think about in which format you want to save those docs, once transferred to the new system. For that option, go into the Save section, Save Documents, and under: "Save documents in this format" select whatever format you wish to save them as.