Repair Function - Majority Unwanted Changes

I decided to make this post because I used to have a lot of problems with xp logo. Somehow it look like, with help of google, I fixed it but it doesn't work as it should, so I would like to kindly please for your help.Here is description:About a week and a half ago when I boot my PC (no matter from restart or from turning PC on), it used to freeze when XP Logo appeared on the screen. Everything I have done (before this began) was uninstalling, reinstalling and using once Spybot Search & Destroy. Progress bar stopped in the middle of "filling". I haven't been able to come to the desktop. I couldn't use safe mode and I was getting the error message:We apologize for the inconvenience, but Windows did not start successfully. A recent hardware or software change might have caused this. If your computer stopped responding, restarted unexpectedly, or was automatically shut down to protect your files and folders, choose Last Known Good Configuration to revert to the most recent settings that worked. If a previouns setup attempt was interrupted due to a power failure or because the power or reset button was pressed or if you aren't sure what caused the problem choose start windows normally.