Got some new RAM and an extra hard-drive for an old XP machine. Windows crashes on startup. Swapping back to the old RAM hasn't resolved. It started crashing when I opened a new process at first, then became more frequent as time passed. Now, I cannot even get past the Windows logo. Previously, along with this, it kept looping at startup and rarely got to the login screen (although I believe to have fixed this.) I have run a mem-test (Only option that worked) through an Ubuntu boot disc and it didn't detect any errors so I don't believe it is my RAM. I am truly confused on this and would appreciate any and all assistance in this matter. I will attempt to upload my computer specification soon, as I do not know them at the moment.