Hello,Registry Mechanic or CCcleaner no good? I would lose the Reg Mech, CC is good. But I would avoid regitry cleaning as much as possible.
First restart your computer in Safe Mode with Networking (only XP and Vista) and see if you can open the file or programs in question. If so, it’s not a “real” permission issue, it’s a program or process on your computer that is giving the error.
If you get Net access then...
Go here to Doug KNox's Windows® XP File Association Fixes
Run 9th down on left... EXE File Association Fix
... the EXE not EML one.
If neede do the one that worked agin and that's all.
Was it this one?
Go to Start ... Run and type in cmd
A dos Window will appear.
Type in the dos window: netsh winsock reset
Click on the enter
Also if you connect again do the MBAM scan in post 6.
If you have an Install CD run SFC
Please run SFC (System File Checker)
Please run System File Checker sfc /scannow
... For more information on this tool see How To Use Sfc.exe To Repair System FilesNOTE for Vista/WIN 7 users..The command needs to be run from an Elevated Command Prompt.
Click Start, type cmd
into the Start/Search box,
in the list above and select 'Run as Administrator
You will need your operating system CD handy.
Open Windows Task Manager....by pressing CTRL+SHIFT+ESC
Then click File
.. then New Task(Run)
In the box that opens type sfc /scannow
......There is a space between c and /
Let it run and insert the CD when asked.