'hidden' checkbox of 'file properties' is disabled

[BertB]

The 'plan colombia' virus has set all my mp3-files on 'hidden'. I cannot change this because the 'hidden'checkbox of 'file properties' is disabled.
I know how to show hidden files, but this is risky because all system files are then visible too.
How can I enable the 'hidden'checkbox of all my mp3's?

[degsy]

Check that you removed the virus fully & correctly. If it remains it may becuasing the inability to unhide your files.
http://vil.mcafee.com/dispVirus.asp?virus_k=98684&
http://www.antivirus.com/vinfo/virusencyclo/default5.asp?VName=VBS_COLOMBIA