Any PC with a Windows 8 logo sticker has secure boot enabled by default. Secure boot can make Windows 8 very resistant to low-level malware such as rootkits.
If you have secure boot enabled, you may sometimes need to disable secure boot first before being able to boot from a USB flash drive depending on your UEFI firmware settings.
Sounds like you have an issue with your UEFI settings, as it pertains to your BitLocker.
Unlike Encrypting File System (EFS), which enables you to encrypt individual files, BitLocker encrypts the entire drive. You can log on and work with your files normally, but BitLocker can help block hackers from accessing the system files they rely on to discover your password, or from accessing your drive by removing it from your computer and installing it in a different computer.
When you add new files to a drive that is encrypted with BitLocker, BitLocker encrypts them automatically. Files remain encrypted only while they are stored in the encrypted drive. Files copied to another drive or computer are decrypted. If you share files with other users, such as through a network, these files are encrypted while stored on the encrypted drive, but they can be accessed normally by authorized users.
If you encrypt the operating system drive, BitLocker checks the computer during startup conditions that could represent a security risk (, a change to the BIOS or changes to any startup files). If a potential security risk is detected, BitLocker will lock the operating system drive and require a special BitLocker recovery key to unlock it. Make sure that you create this recovery key when you turn on BitLocker first time; otherwise, you could permanently lose access to your files. If your computer has the Trusted Platform Module (TPM) chip, BitLocker uses it to seal the keys that are used to unlock the encrypted operating system drive. When you start your computer, BitLocker asks the TPM keys to the drive and unlocks it.
If you encrypt data drives (fixed or removable), you can unlock an encrypted drive with a password ***** a smart card, or set the drive to automatically unlock when you log on to the computer.
You can turn off BitLocker at any time, either temporarily by suspending it, or permanently by decrypting the drive.