Quick420, hello. You will *not* find Windows 7 mentioned in the boot.ini file. The Windows 7 boot manager is still installed on your system. That bootmgr file and the BOOT folder are part of it, as you suspected, but not all of it.
To fix this, you need to download and install the freeware utility EasyBCD. There are two ways to handle it.
1) You could leave the boot manager alone, set XP as the default OS and set the timeout to 0. In EasyBCD, click on the Change Settings button, then under Global Settings select XP as the default OS (if it's not already done). Set the Bootloader Timeout to 0, then click the Save Settings button. After that, you should not see the boot manager screen again.
2) You could ditch the Windows 7 boot manager and restore the system to booting XP-style. In EasyBCD, click the Manager Bootloader button, then under Bootloader Installation Options, select Uninstall the Vista Bootloader (use to restore XP), then click the Write MBR button. Note that the Vista and Windows 7 bootloaders are essentially the same thing.