Local corrupt file
Hello,when i login the system is showing problem loading file due to security threats and local corrupt file.the windows cannot open old file and opening only temporary file.changes made to this will be lost when you log off
Seems you have a corrupt user profile.
What I suggest is to create a new user login in Windows, login as that, restart your computer, backup all your files you want from the old profile from C:\Documents and Settings then delete the user profile from Windows, then login again and recover your files from the backup.
There are a number of steps you have to do, but if you Google, "creating a new profile +win xp", I'm sure someone's written an article on how to do this already.