A couple of days ago, I bought a 15' Retina MacBook Pro. For work reason, I installed 64-bit Windows 7 on it, a few of boring issues found and fixed.
Maybe you are experiencing these issues now, so, I share my solutions to help you anyway.
1. Install Windows 7 using usb disk, system complains about "not found CD/DVD drives".
Fix: Insert your usb disk on left side usb slot instead of right side usb slot. Reason: unknown.
2. Keyboard not function when logining to windows at first time
Fix: Use on-screen keyboard. Click bottom left button, check on-screen keyboard option, on-screen keyboard will appear,
you use this virtual keyboard to input your username and password. After logged in windows, keyboard may works as usual.
3. Tilde/backtick wrong mapping
Fix: Try using the "United States-International (Apple)" input method. You can add it in the Control Panel -> Language. (refer this)
4. Incorrect date/time in Windows
Fix: Look at this.