after using a removal procedure of antivirgear, my desktop wallpaper was removed. The infection was removed already but I want to change my desktop wallpaper, please help.

This may do the trick.. it certainly won't harm your sys:
==Please copy the text between the lines to a notepad [format/wordwrap unchecked] and save as fixkey.reg, as type "all files", to your desktop; dclick it to run... agree; if it opens in notepad instead rclick the icon [file], choose Open with, Registry editor....
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Windows Registry Editor Version 5.00

[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop]
"NoChangingWallpaper" = -

[HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop]
"NoChangingWallpaper" = -

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Antivirgear is rogue virus/malware protection software, is being spread by a trojan named Zlob.

Please see the information about Antivirgear and remove it as soon as it has been detected!

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