This can happen when you install themes on your memory card. It won't happen if you install on phone memory. You just need to delete some .sis files from the card.

Two ways to accomplish this:
(1) Use a card reader
Navigate to: E >> private >> 10202dce and delete whatever .sis files or subfolders you find inside the 10202dce folder. Of course, you will have to enable the 'view hidden/invisible files' option on your computer first.

(2) Use X-plore or ActiveFile
This is for hacked phones only. (Please don't ask me how to hack.) Same method as (1) except you do it without removing the memory card.

Hope this works for you!

Maybe the "problem" your friend mentioned is referring to the fact that Quickoffice has only 3 typefaces (Times New Roman, Arial, Symbol) . So fancy fonts (or any font other than the default 3) will not display. You'll still be able to read the text, of course.

If documents do not need to be edited (e.g. resumes, office memos, invoices, receipts, etc), then stick to PDF files. The E71 comes with a PDF viewer, too. Your documents will display exactly the way they're supposed to, fancy formatting and all.

Did you try Google? search key: S60 3rd, medical software

Or are you referring to Jack Sparrow stuff? If you are, then someone else will have to help you.

@Voxe
Set your phone date back a year or two before installing the theme.