Alarm #100 means that the Parameter write/protect switch on the main board is on. That switch is designed to prevent you from changing parameters by accident. You must turn off that switch, then hit RESET to get rid of the alarm and run normally.
The VRDY alarm means that one or more of your servos isn't coming up ready. When you release E-stop (or just power up the control without E-stop), the big MCC contactor on the back of each drive unit should pull in with a "thunk" and the motors should come under power. If the contactors never pull in, that's a problem on the CNC (maybe you're in E-stop). If the contactors pull in, then drop off again, that's usually a servo problem. It's also possible that your control is never coming out of E-stop for some reason. Look to see if an overtravel switch is on or stuck. There are usually two sets of overtravel switches. One just give the OT alarm and lets you back away, the other puts the control into E-stop and disables the servos. That's a "backup" safety switch in case the servo simply runs-away. Most machine tool builders wire all these extreme OT switches in series, so if any one of them is actuated, all the servos shut off and you stay in E-stop.
Hope this helps.