My hidden folders are turning into protected operating system files. How do I change them back to normal?

I am using Windows XP. Some of the folders that I have hidden, which were certainly not operating system files when I first downloaded them, have for some reason turned into protected files. Now I am unable to delete them. Anyone know of some procedure or a program that might be able to change them back?My hidden folders are turning into protected operating system files. How do I change them back to normal?
Yes,maybe it is infected by some viruses.

I met a virus,which have my some folders hidden,and made some fakery folders so as to misleading me.

I think some viruses often change windows registry or some system setting,so,I use registry guarder,antivirus tool.

If you have no idea to change it back manually,you should try some tools.

Give you a tool, I am using now.My hidden folders are turning into protected operating system files. How do I change them back to normal?
The show hidden files and folders isnot working at all. If Iselected the radio button “Show hidden files and folders”, and then press Ok .. the changes would just disappear upon opening the dialog again. It was probably some virus attack after which the Windows registry was not being updated properly. So here is what I did to restore it back.

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