Look,there are some malwares (junk stuff) that can do such things-disables
some Administrator rights.
You say you can add the registry,so you are probably a victim f such junk.
So check if you are a victim of them
You need
1.An antivirus software (updated definitios and current version)
2.SpyBot Search and Destroy (updated definitios and current version )
I suppose you can access the internet,so download the trial version of
F-prot Antivirus 3.16c (+ its definitions) and SpyBot S & D (+ definition)
http://www.safer-networking.org/microsoft.en.html
(get the exe file ,version 1.4 , and the newest definitions )
and
http://www.f-prot.com/download/home_user/
(from here get the Windows version and the 2 definition files that are at
the end of page)
When you have downloaded them,copy and paste them in the Shared folder that
is in My Computer
Then restart with booting in Safe Mode
Do this by repeatedly typing F8 while Windows is starting before
Windows logo appears.
Then you'll open the BIOS menu where you can choose to boot
the hard drive in SAFE MODE
(If you are XP user ,find more about Safe Mode
in Help and Support Center ; Start-Help and Suport)
When you are in Safe Mode,access the hidden built-in Administartor account
and
install SpyBot S&D + its definitions
restart and boot in Safe Mode again
install F-prot AV and unzip the definitions in its folder
C:\Program files\FSI\F-prot
restart with booting in Safe Mode
Scan with F-prot and with SpyBot
Remove all the junk found.
Boot in Normal mode and most of the things should be OK
--------------
If nothing bad is found by F-prot or SpyBot S&D ,
you may try repair install of your Windows XP Home or full re-install
If you do not know how,please take your computer to a professional store
where IT specialist will help you
(Before that, create a back-up of all your data needed)
Good luck !
--- Useful pages ---
http://www.microsoft.com/athome/security/downloads/default.mspx
different kinds of free or trial security software.
http://www.pandasoftware.com/about/resp_social/children_internet
Because of the campaign "Children and the Internet"
Panda Software offers 90 day free trial version of one of the best security
software
Panda Platininum Internet Security 2005
http://www.pandasoftware.com/protected/tips.htm
useful tips for protecting computers
http://www.pandasoftware.com/products/activescan/com/activescan_principal.htm
Panda Software free Active Scan,where you can check your
PC for ALL TYPES of security threats and clean viruses and worms
http://housecall.trendmicro.com
Trend-Micro free online scanner HouseCall where you can scan for
Viruses and Spywares and clean them. CWShredder is also available here
http://www.kaspersky.com/virusscanner
Kaspersky free online scanner
and checker for suspicious files.If you have issues with suspicious
file,here is the right place!
http://www.f-prot.com/virusinfo/submission_form.html
Send F-prot AV suspicious files for fast analyze and and it is all for FREE
http://www.microsoft.com/malwareremove
Microsoft Windows Malware Removal Tool
http://support.microsoft.com
Free Microsoft support and suggestions (for genuie clients)
Panda_man
"Let's beat malware black and blue"
"No new epidemic of all kind of malware -> Panda TruPrevent"