You could......if it bugs you..? At your own risk mind you..
Windows XP
Delete the following registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Bags
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\BagMRU
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\BagMRU
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\Bags
Re-create the following registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam
Create and then set the BagMRU Size registry value to 5000 in the registry subkeys that you created in Step 2.
Windows Vista or Windows 7
Delete the following registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Bags
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\BagMRU
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\Bags
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\BagMRU
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags
For x64-based versions of Windows Vista or Windows 7, delete the following registry subkeys:
HKEY_CURRENT_USER\Software\Classes\Wow6432Node\Local Settings\Software\Microsoft\Windows\Shell\Bags
HKEY_CURRENT_USER\Software\Classes\Wow6432Node\Local Settings\Software\Microsoft\Windows\Shell\BagMRU
Re-create the following registry subkeys:
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags