Show Hidden Folders and Files Not Showing

Do as one of our friend suggested or if that is also not worked out for u. do your system restoring.i.e go to help& support there u get like SYSTEM RESTORE then if u know at what time u have done ur mistake ,just mark the date before that day and automatically ur system will be in a position that u have specified.for example if u mark ur date as 12/12/2007 then system will restore the properties that it has on that day.ok na try to do it

Your system is infected by a spyware or malware that is preventing your system to save the settings.. Update your virus scan and do a full system scan.. If it doesn't help, do a file search for "autoexec" (search include hidden files and folders) and delete it...remove the file and reboot...see if that helps