Apparently, I'm having a troubleshoot with both W2K and WXP.
I'll try to summarize: I just got a new PC, and, because it supports both XP and W2K, I had a nice idea to dual boot both of them.
I then created both partitions for W2K & WXP, W2K having 40000GB meanwhile WXP having 80000GB.
Once I installed W2K, it booted just fine. And I managed to install the drivers and etc. However, once I installed WXP (in a different partition), and somehow, W2K stopped booting.
Meanwhile WXP boots normally, W2K gives an "INACCESSIBLE_BOOT_DEVICE" BSoD. I don't know what I did wrong here, I installed both the systems on different partitions however W2K is not booting anymore and instead it is giving me the BSoD.