Changing uppercase to lowercase will have no effect on anything in the registry. No one told you to do that. When working with this kind of stuff, one has to relax, SLOW DOWN and take your time to do things carefully.
If you CAREFULLY and slowly read the instructions in the link provided by the other poster above about the fix, it very clearly tells you where in the registry to look and exactly what to look for. Look for the missing quote pairs in the registry strings under the specific registry key mentioned, just like the example shown and just stick the quote pairs in the right places, again just like in the example shown in the link provided by the other poster above. Then just save and exit. Reboot and if you did it right, the problem should be fixed.
But as was said before, before you start editing the registry, it is a highly recommended to just back it up to your desktop so that if you make a mistake and screw things up, you can easily restore it to the way it was before.
From the example with the salient points emphasized in red:
1. Run regedit
2. Find the registry entry
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
3. Go over the list of startup items. Most of these will be of the form:
(path)\(filename) <optional parameters>
Now, find all the entries where (path)\(filename) is *not* enclosed by quotation marks. Just add the missing marks and you're done!
For example:
C:\Program Files\QuickTime\qttask.exe -atboottime
should be changed to
"C:\Program Files\QuickTime\qttask.exe" -atboottime