The solution to your problem is smitfraudfix if you can run it. 

http://forums.us.dell.com/supportforums/board/message?board.id=si_hijack&message.id=34432

 Have a friend download it and extract it to a floppy (or CD).

Then boot into Safe mode (F8) with Command Prompt.  Login with your usual login and let it go to the black screen.

Type:

a:

cd smitfraudfix

smitfraudfix.cmd

Follow the prompts.

Alternatively if you can't get the fix:

boot into Safe mode (F8) with Command Prompt.  Login with your usual login and let it go to the black screen.

Type:

dir /a /s wininet.dll

It will search your system for several minutes and tell you where all of the wininet.dll files are.  The one in C:\Windows\System32 is bad as well as the one in C:\Windows\System32\dllcache if present.  We want to delete them:

cd \windows\system32\dllcache

(prompt should say C:\Windows\System32\dllcache)

 

del /f wininet.dll

cd \windows\system32

(prompt should say C:\Windows\System32)

del /f wininet.dll

Locate the newest one from the output of the dir command that does not have the same date or size as the one in System32.  Let's say for example it is in C:\Windows\i386

copy \windows\i386\wininet.dll \windows\system32\

reboot by Ctrl + Alt + Del  and select Shutdown.  It should boot up into regular mode.  Get and run the smitfraudfix immediately.

 

Post a new HJT log as a reply when done.

Ron