I have always had problems updating eset, I have had the program for many years and progressed through the various upgrades always having to un-install despite being advised you could upgrade over the top. So I was fearful to move to V4 but gave into the temptation and here is my woes. Vista ultimate SP1 I un-installed V3 using add remove and was asked to reboot which I did, as the OS was loading after post I got a BSOD and this happened repeatedly until I loaded in safe mode and recalled a system restore point and rebooted. V3 then could not configure the firewall! I un-installed again! and the same BSOD! until I loaded 'last known good configuration', when I got to the desktop I noticed that the eset icon was missing, I checked resources and found ekrn still running, I went to services and disabled eset services then stopped ekrn running. After that I then installed V4 after it installed it told me it could not configure the firewall, at this stage I was about to re-install the disk from a mirror I do each week but rebooted to find V4 was running I presume okay. Why can't I un-install eset without having my computer crippled? I worry about the next upgrade to V4 and just what I have to do to make that happen. My computer is a intel dual core HP laptop with 4 Gb memory and is bogg standard with the normal programs such as Office Adobe etc. What do I have to do to get a clean install? the way it is now it looks like I have no choice but to use eset as I can't remove it and have a computer that works David I do have A Memory dump file it is large 169 Mb but I can send it if you give me the method.