Unable to show hidden files and folders in Windows XP

I have some great problems. I want to show hidden files and folders in my system with Windows XP PRO SP2 installed. I already checked "Show hidden files and folders" by going to Tools -> Folder Options -> View and then I confirm it by clicking OK. But nothing happens. Also hidden files are still hidden.

I went there again just to confirm that my settings were saved but unfortunately the "Show hidden files and folders" option is still disabled (unchecked).

I am using Avast antivirus 4.7 with an updated virus definitions. I did a complete virus scan of the entire hard drive but the virus has not been detected.

What can I do to eradicate this problem?

Just go into the registry and check a few key values:

Start -> Run -> Type "regedit" and press "OK" -> HKEY_Local_Machine -> Software -> Microsoft -> Windows -> CurrentVersion -> Explorer ->
Advanced -> Folder -> Hidden

Here you will find 2 sub-directories namely "NOHIDDEN" and "SHOWALL"

Set the below key values in NOHIDDEN:
CheckedValue = 2
DefaultValue = 2

and in SHOWALL:
CheckedValue = 1
DefaultValue = 2

Close the registry editor and now repeat the same things again. Theoretically it should work.

Thank you mv, I followed your advice but unfortunately it does not.

Tried to change the values in SHOWALL as follows:
CheckedValue = 1
DefaultValue = 2

But CheckedValue is always 0.

Do you have an idea ...

AVAST shows me the problem of "tmf3w3g0.com".

Quiet common issue. Restart in Safe mode and disable System Restore. Go to a DOS console by clicking on Start, Run, type "cmd" and press OK button.

Code:

---

cd \
dir /a:h
del autorun.inf /a:h /F
del tmf3w3g0.com /a:h /f

---

Code:

---

cd Documents and settings
cd user (your username)
cd Local settings
cd temp
dir /a:h

---

the there must be a dll with a 7 inside like r7.dll:

Code:

---

del r7.dll /a:h /f
cd \
cd windows
cd system32
dir /a:h

---

you should find 1 or 2 (may be 3) files beginning with kavo, so

Code:

---

del kavo.exe /a:h /f
del kavo0.dll /a:h /f

---