We are having a similar issue. Since installation of XTools 2.x from 1.1, work stations are not able to do anything. Simply adding a layer or data to the map caused ArcMap to crash. Uninstalled v2 and reinstalled v1 and problem is gone.
Other Data East products
With CarryMap you can make your ArcGIS project mobile.
TAB Reader - Data East's input to ArcGIS interoperability capabilities.
Well Tracking - tools for management of well drilling data in oil and gas producing companies.
Personal IMS - Internet map server for publishing ArcGIS maps in Internet / Intranet.
JokerClick - extension providing easy access to the most frequently used ArcGIS tools.
