You didn't actually describe the problem you are seeing.
Please tell us the problem, so we can try to help you.
The problem is/was that when using the Type tool in CS5 the programme would not permit the use of lowercase letters. When typing a lowercase letter e.g ”k” it appeared as “K”. I also run on that same computer Elements 11 and was able to use the Type tool for both upper and lowercase script. My other programme such as MS Word, Excel etc. were unaffected. I tried uninstalling CS5, closing my computer and reinstalling CS5 but the same error was perpetuated. In frustration, I believe I have successfully affected a repair by loading a PSD image produced on another computer which included upper and lowercase lettering and was able to alter the typescript image on that image in both upper and lowercase script using the CS5 Type tool. This morning when loading a “New” blank file I was able to use the Type tool in both upper and lower case script. The problem appears to have disappeared, but no doubt you may understand why this problem existed in the first instance. I look forward to hearing from you.