If using your phone as mass storage device doesn't work, you can just take out the memory card from your phone and insert it directly to your computer. The memory card should appear as a removable drive in "My Computer". You can now transfer files from your phone to your computer and vice versa.
Please refer to page 73 of the user manual to see how to connect your phone to your PC via the mass storage option. Please note that you must have a microSD card installed to do this. Once connected you can access the memory card on the phone like any other drive on your computer to take pictures off the memory card or add pictures to the memory card by copy and pasting.
Download the user manual from the LG Bliss product page.