Hello, for several reasons I want to try to repair my Windows XP Pro sp3 installation which does not start anymore after some driver/hardware problems. I installed a ATI Radeon PCIexpress 16x graphic card HD5550 on my System (motherboard NVidia Geforce 7050M-M with a graphic chip onboard Geforce 630a onboard). After several days with at least one BSOD a day, I got to know that this configuration is rarely compatible. I tried to uninstall the ATI Drivers but this uninstall failed. ATI asked for a disk with a special file and I put the CD, although the drivers on the system were newer than those on the CD, because I did not have an alternative. After restarting I got error messages that there is a problem with a certain ATI file (I think a dll). Finally I got a BSOD after the login each time. Unfortuantely I had to return the graphic card HD5550 because of the time limit of two weeks so I uninstalled the graphic card and returned it. Unfortunately I could no longer log in afterwards. Each time I start the partion with the win xp pro system,before arriving at the LOGON Screen, everything works well: the mouse and also the keyboard (tested with BIOS). At the LogIn Screen I can use the mouse everywhere, but just hitting one time the keyboard, everything freezes. Neither the mouse nor the keyboard is working. Nothing is entered in the filed for the password and the mouse does not respond. I already tried several tricks from internet as CRTL + Alt + Del, ALT + TAB) After trying a reparation with the CD I got the same phenomeneon when trying to enter the key while installing Windows: I use first 1) install a windows intallation 2) (after accepting license) repair tipping "r". So windows begin to install reairing the system, but when I arrive at the license key, it freezes, as before. The same with the safe modus. no restauration or working last good configuration seems to be available according to windows (I already tried this). There are several restauration points on the disk at C:\system configuration, which I can access using another installation on a second partion, but I am not sure if there is any one useful. Also I wonder how to use the earliest of them. Do anybody have an idea how to repair this ? Thanks Tommy PS: The installation is quite big, with many programs (177). Some of them take several days to install (several programming environments, many updates and third party components (delphi, JAVA etc.) .