I have already have posted the solution of this problem in my earlier posting
but here it one more time
REMOVE THE FILES FROM YOUR HARD-DRIVE:
-Right-Click on My Computer and select Search...
-click All files and folders
-search for *.bmp (all or part of file name)
-Find the one that matches your background
-Note the name of the .bmp file - mine was called phccekj0e3cn.bmp (copy and paste into notepad or something as you weill need this later, or write it down as your computer can reboot)
-Search your drives for the last 3 characters noted in previous step. in my case I searched on *3cn
-This search resulted in 4 files for me.
-Go to your task manager, look under the processes tab, and find the process that matches the name of one of the files you are trying to delete (the .exe file)
-end the process - mine was called lphccekj0e3cn.exe
-delete all files found in your search
REMOVE REGISTRY ENTRIES: (not as important since the files are no longer there but still good idea)
-Start -> Run
-Edit -> Find
-I searched on *3cn (the last 3 characters) but this returned some valid registry entries. I suggest you either carefully delete all entries that look they are related. I found 5 or 6 valid entries, but they were obvious to me to not be related.
-typically they will have the full name like "lphccekj0e3cn" In fact you could probably search on whatever the .exe name was (minus the .exe extension) and you can surely delete all those entries.
FIX REGISTRY ENTRIES:
-this is what I missed in the previous post. The first time this thing runs it changes entries in your registry to hide the 'Desktop' and/or 'Screen Saver' tabs
-In the registry navigate to:
-delete entries 'NoDispBackgroundPage' and/or 'NoDispScrSavPage'
Check out your display properties again, they should be back to normal.
Empty your recycle bin to get rid of it for good
Rebooting at this point is probably a good idea.
p.s. if u have prob finding the bmp files try to find it as file named as "pch or else try 3cn"