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.