Solved; IDE loads but will not compile

Hope to save some others some time. Two Win 7 PCs, installed 1.0.5 Comm port active, environment loads as well as a sketch. Attempt to verify or load and the environment closes when the progress bar reaches 1/4 to 1/3, uninstalled 1.0.5 and installed 1.0.4 that I had on a different PC, with the same results. Turned off all antivirus, same result, finally tried uninstalling MalwareBytes anti-exploit and now both PCs run correctly. Dave