All Files Have Become Read Only. Help Please


Jan 23, 2006
Hi, all the files in my dads computer have become read only and I cannot even think where to start looking for the problem.

His specs are

Asus A8V motherboard
Athlon 64 3200+
Nvidia FX5200 (128MB)
1GB Value Ram (mixed brands)
Windows XP Pro Media Center Edition.

The tick in the read-only box is grey when ticked, not the usual black. If I untick the box and hit apply it says ok. But when reopend it is clearly ticked again.
Could this be a virus? Is there a setting in the back of windows that can cause this. As far as I can see this has happened to all the files without exception.