Softwares not installing due to in sufficinet permission in 'Program Files' & Registry keys; InterNet not working after Windows 7 upadates:- This is a new Dell Vastro 1014 laptop with Windows 7 Home Basic 32 Bit OS. Although I am the admin & the only user in my system, then also I am:- 1) Not able to install any new software in 'C:\Program Files', due to "Error opening file for writing:" for all installing .exe file. Detail log shows "Can't write: C:\Program Files\CCleaner\Lang\lang-1031.dll" 2) Not able to install MS Office 2003, as I am getting "Error 1404: Setup cannot delete the registry key \Software\Classes\.tif. Verify that you have sufficient permission to access the registry or contact your Information Technology department for assistance." I've tried following, but these didn't worked:- 1) In the registry I gave full access to the user, but in the 'Advance' option when I tried to check 'Replace all child object permissions with inheritable permissions form this object' I got error. Thus all though I got the full access I am not able to delete the registry key HKEY_LOCAL_MACHINE\Software\Classes\.tif. 2) By default HKEY_LOCAL_MACHINE does not have my user name in its security group. So I added it & gave full permission, but when after restart when I check the HKEY_LOCAL_MACHINE's security group my users was gone.. This happened several times 3) For folder 'C:\Program Files' I changed the Ownership from Administrator to my owner, but in the 'Advance' option when I tried to check 'Replace all child object permissions with inheritable permissions form this object' I got error. Although it shows that my user have full permission I am not able to do the above action. 'Program Files' folder's property shows attribute 'Read-Only'. I tried to change the attribute 'Read-Only' but that is also not changing. 4) I've Macfee 8.7 enterprise installed on my system(I don't how it got installed without any problem!). I update it on daily basis & I've scanned my system several times, but no virus was detected!! I tried installing AVG demo, AVAST demo & MaCfee demo all the installed aborted saying the 'Internet connection is not active'. Although I was surffing net at the same moment. I tried them several times, used LAN cable but the all the installed stated the internet connection problem. 5) After applying microsoft updates net is not working. After diagnosis it showed 'Diagnostic Policy Service' is not running. When I tried to manually start this services I got Error 5. I've formatted the C: drive & installed Windows 7 several times but the above 3 problems persist.. Please help me to find the solution, as my system is not working properly & no s/w, addins are getting installed. Thanks in advance.. Vini

Item #1 reply: You can right-click the CCleaner install app and select "Run as Administrator". This may help. Item #4 reply: Did you uninstall Macfee before attempting to install AVG, etc ? If not , you must. You cannot have multiple antivrus sotwares installed at the same time.