History: I have tried to clean out my PC by uninstalling all my unused programs. Some programs I could remove automatically and other programs I had to remove manually by deleting the unused program directories, going into the REGEDIT, and doing the search and delete. I have also tried to remove viruses by using a trial version of an anti-spyware program. The name of that program which I have forgotten but I do remember I told it "OK to remove all the infected files". After I did the restart, I got the problem. Problem: The problem is that I can login fine but I got stuck right before the desktop items and the START bar should have come on. In this stuck mode, I can do the CTRL-ALT-DEL and the Windows Task Manager would pop up and I can run many programs from the Task Manager (File > New Task (Run…) > REGEDIT). Things I have tried: I have browsed my problem PC from the Task Manager and it has shown all the drives, directories, and files. I have run "sfc /scannow" but it didn't show any problem. I have run msconfig, compmgmt.msc, freecell, regedit, and others. I have upgraded the XP Home Edition to the XP professional thinking that it would solve my problem but the result is the same. When I ran the explore.exe, I saw the START bar appeared and then disappeared very quickly. I have a feeling that I have deleted some thing in the registry that I shouldn’t have. I hate to do a fresh install because of the programs have installed. Please help.