OK lets deal with the LEGACY_SYMxxxxx entries first, before doing anything, you need to be logged on as a user with administrator privileges, the next thing we are going to do is export a copy of each legacy key. We are going to back-up each key (export), change its permissions and then delete the key.
1. Right click on the first one, LEGACY_SYMDNS and select Export, choose a location (where you can find it again if required) to save it into and give it a meaningful name legacy_symdns is fine.
2. Right click it again and select Permissions, you will see the Security Tab with two Group or User Names, Everyone and System.
3. Highlight Everyone in the window below tick allow box opposite Full Control and click OK. This is needed so that you are able to delete this key later.
4. Right click it (LEGACY_SYMDNS and nothing else) again, select Delete, you will get the usual Confirmation window. This will give you a means to escape if you made any mistake, click Yes to proceed.
Now you need to do that for the remainder of the LEGACY_SYMxxxx keys.
Once you have done that reboot.