I have spent the last week or so trying to solve problems mainly with Avast antivirus. Trying not to be too long-winded (unless asked for more info) it didn't work properly - giving error "Not enough user rights to continue" amongst others. The problem was solved by reinstalling in safe mode. During the investigation I found that some of the Avast files and, subsequently, many other files had their attributes changed to read only. This stopped updates and uninstallation on several programs until I discovered what the problem was. I had PG disabled at the time but if the files had already had their attributes changed then that would make no difference. Is this something that PG does? If not, then I seem to have been hit by something else - although can't trace anything. Any thoughts anyone please? Jim.