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breretonms

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C:WINDOWS\System32\rundll.exe appears

when I try to open or change accounts etc this windows appears.
I tried to restore and it asked for adminstrator pass word,when I put my password in it failed and only get three goes . how can I search regedit to reset password as the only option is to reformat  
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thank you all for your replys, when I try to open a program such as run, it opens a window asking to chose what  program to select to open it with.I can browse but I don't know where to look for the file to open regedit,  When I tried to run digital patrol, the program could not open the drives.
thank you all for your replys, when I try to open a program such as run, it opens a window asking to chose what  program to select to open it with.I can browse but I don't know where to look for the file to open regedit,  When I tried to run digital patrol, the program could not open the drives.
Thank you breretonms

From what you have said, some malware has definitely been messing around with your file associations.  A file association is the program set in the registry to open files of a certain type.

To fix these associations, you need to be able to open Regedit.  You will find a good tip at the top of this page:
http://www.dougknox.com/xp/file_assoc.htm
which tells you how to open Regedit.

Below that, on the same page, you will find links for a lot of Windows XP File association fixes.  I recommend that you download and unzip them to separate folders.  Once you have regedit open, you can use the File > Import menu and then browse to the *.reg files.

I suggest you go first for the *.exe and *.reg association fixes:
http://www.dougknox.com/xp/fileassoc/xp_exe_fix.zip
http://www.dougknox.com/xp/fileassoc/xp_regfile.zip

After that, you should be able to Right-Click on a *.reg file and choose "Merge" to write it to the registry.

You will then be able to get some idea what other file type associations have been messed up, and you should follow the advice by rpggamergirl who believes as I do that you have a virus.

Often malicious software like a virus can disable your installed anti-virus program, so I suggest that you uninstall it, reboot, re-install and update it over the internet, and then perform a full system scan.