Running Mac OS X Lion 10.7.3 On Windows 7

Step 1: Download the OS X Lion Update 10.7.3 (Client Combo)
http://support.apple.com/kb/DL1484

Step 2: Find and Double click to open up MacOSXUpdCombo10.7.3.dmg

Step 3: When a new folder pops up, double click to open MacOSXUpdCombo10.7.3.pkg

Step 4: Press continue

Step 5: Press continue

Step 6: Press continue

Step 7: Press Agree

Step 8: Press Install

Step 9: Press Install software

Step 10: Press continue installation

Step 11: Press restart

If you've followed these steps correctly, and I don't know how you could mess up, you should have upgraded to 10.7.3 flawlessly. Congratulations!