Clean install of vista. Install ESS 4.2 appears to work but then does not start up as expected. Restart laptop and a dialogue box is displayed saying configuration file not found. Update doesn't work & if I look at user name & password it is blank (despite me entering it during install). Re-entering it does not result in it being saved. Similarly unable to change firewal options, but error given immediately. Un-installing beta and re-installing beta does not help. Interestingly C:\Program Data\ESET was not created either http://kb.eset.com/esetkb/index?page=content&id=SOLN2116 Repeated above after all windows updated done -> same problem Installing ESS 4.0.474.0 after this proceeded without any issues. Hope this helps identify a bug. Will try upgrading to 4.2 tomorrow to see if that goes smoothly.