Unable to show hidden files and folders in Windows XP

[Jacob.d]

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?

[mv]

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.

[Jacob.d]

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".

[mv]

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.

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

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:

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

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