What computer upgrades do I need to play Blu-Ray discs?

[hbenthow]

I know that I need to get a Blu-Ray drive (my computer currently only has a DVD/CD drive), but I don't know what other upgrades my computer needs in order to be able to play Blu-Ray discs. I have tested my computer's ability to play HD video by playing some HD video files on it with VLC Media Player. 720p video plays very well, but 1080p video almost always is very jerky and usually gets stuck (the audio track keeps on playing, but the video is frozen). So, it appears that even with a BLu-Ray drive, my computer couldn't play Blu-Ray discs, at least not satisfactorily. I need to know what I need to upgrade my computer with.

Here are my computer's specs:

Emachines EL1210

2GB RAM

AMD Athlon 64 LE-1620 CPU

156GB Internal Hard Drive, 1TB External Hard Drive

KM-718 (1152x864@60Hz) 256MB GeForce 9200 (Acer Incorporated [ALI]) Graphics Card

Windows Vista Home Premium 32-bit SP2


Does anyone know what I need (other than a BLu-Ray drive) in order to give my computer Blu-Ray playing capabilities?