Thanks for the suggestion, lando242. I made a mistake in my original post. It is Opera 12.17 not Opera 17 that I can't uninstall. Sorry about that.
I tried what you suggested but unfortunately it didn't work. After I installed the latest version of Opera and removed it, the old one was still there. I tried to re-install Opera 12.17 but this produced the same message "Cannot initialize Opera due to lack of memory: module 25".

When I try to uninstall Opera 17 using the Control Panel in Windows 7, I get the message "Cannot initialize Opera due to lack of memory: module 25". How do I uninstall Opera 17?

I am using Opera 12.17. Recently when it fell over I got a message advising me to upgrade. I did so and the new version had bookmarks as icons with 6 to a screen instead of about 50 in Opera 12.17. Fortunately the old version of Opera was still there, and I have gone on using that.

The way it handles bookmarks is one of old Opera's big pluses. I like the fact that I can put them in a tab, and they display in folders and subfolders, and can be searched.

I have now received the option to upgrade to the latest version. If I upgrade can I have bookmarks as they are in old Opera (no icons, in a tab or sidebar, folders & subfolders, searchable)?

Thank you.