There are in your computer registry that you may never use. The registry probably slows your PC down. What are needed and what unwanted. You may all know how to delete the unneeded fonts and backup files. How can you clean up registry unwanted? You will find the answer here. Note: Before doing the following procedures, you should back up the Windows registry for restore in case you clean up some needed registry.
Remove the redundant virtual drive icon
After a virtual drive is installed in the system, an extra CD-ROM icon appears in “My Computer”. The virtual drive icon remains there even if the virtual drive is no longer used. So the icon should be deleted. Click the "Start → Run", input the "regedit" command to open the Registry Editor, unfold HKEY_LOCAL_MACHINE \ Enum \ SCSI branch. There are under SCSI usually two sub-keys which correspond to the virtual drive and physical drive. Delete all the sub-keys under SCSI and restart the computer. The virtual drive icon has been removed.
Remove redundant system-level icon
System-level icons refer to those automatically created by system when installing Windows, such as Recycle Bin, Inbox, Network Neighborhood, etc. Some of them are useless for users. Open the Registry Editor, and unfold HKEY_LOCAL_MACHINE \ Software \ Microsoft \Windows \ CurrentVersion \ explorer \ Desktop \ NameSpace then delete the unwanted sub-keys.
Delete redundant options in "Find"
Unfold HKEY_USER \ Default \ Software \Microsoft \ Windows \ CurrentVersion \ Explorer \ Doc-FindSpecMRU, delete the relevant keys in the right-side window. This may in a way speed up your PC.
Remove the unneeded keyboard layout
Windows is trying to become users friendly. So the keyboard layouts are suitable for people from different countries. Open the Registry Editor, unfold HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\KeyboardLayouts, then you’ll see Spanish (Traditional), Danish, German (Standard) and other keyboard layouts. Delete these sub-keys if you do not use the layouts.
Remove the Locale
Similar to the keyboard layouts mentioned above you should also clean up registry of the Locale. In the Registry Editor, unfold HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Control \ Nls \ Locale. If you only use Simplified Chinese, just keep the key "00,000,804" and delete the others.