just do this to make yur 4gb pendrive wrk perfect
Open Command Prompt -> Type the drive name say G: -> Type ATTRIB -H -R -S AUTORUN.INF -> Type EDIT AUTORUN.INF -> A new window appears; delete all the contents and click on File -> Save and click on File -> Exit
On command prompt -> Type ATTRIB +H +R +S AUTORUN.INF -> Type EXIT
Remove and reinsert the pen drive.
Now, The virus is completely removed.
thts all enjoyyyyyyyyyyyyyyy