Can someone help me fix my Tekkit crashes?

[mastergamer713]

My tekkit keeps crashing and lagging. Is there anyway I can fix this?

Here is my system settings:

CPU 3.00 GHz

RAM 3.00 GB

Graphics Card Memory 128.00 MB of Memory (RADEON X300 SE 128MB HyperMemory)

Hard Drive Space 78.1GB

Java: Latest Version 32-bit

Operating System: Windows XP

I really would like to play Tekkit or Reqular Minecraft. Can someone please tell me what is causing Tekkit to crash so much.