To remove that black arrow from ur desktop icon.

follow these steps
click on start> run> type regedit
u'll see ur registry directory'll open
click on HKEY CLASSES ROOT
a lots oe subfolder'll open
then find "piffile" among them> click on it> u'll see 4 options in the left side will appear> now right click "isshortcut" > delete it.
Again find a file named "lnkfile" > click> delete isshortcut in the left window
now close ur registry directory and restart ur pc.
u r done.