Many thanks for your reply. I checked the system in the system configuration and dicovered that it das RAID0 and not RAID1 as I mentioned. I used your custom KRD and the "Tools" button (left to "Quarantine") was visible and active, so I could run the "USB Recover Tool" that eliminated Kaspersky drivers from 3 registry entries. After restarting the PC (without KRD) I was able to login to windows as the keboard was now enabled. No problems with RAID. So the keyboard problem is solved now :-). Now I run into the next problem as my home network is not visible anymore and I cannot connect to the internet. So I rolled back the KTS changes using the kavremover utility. After restarting the PC I still could not reach or restore the home network using windows tools. As the next step I moved all oem*.inf files containing the word "Kaspersky" together with their corresponding *.pnf file from "C:\Windows\INF" to another directoy and restarted windows. But there is still no network and no internet connection. Because everything worked well before installing KTS, it seems that the kavremover utility has not rolled back everything. What could I do to restore the network functionality as it was? I'll send you the traces in the next step.