I have a xp including variable %windir%\System32 computer is invalid - how to fix

I have a computer that has been corrupted due to a virus - I cleaned the system and worked fine-but now

When we start we get only a blue screen - I opened the Task Manager and run "c:\windows\explorer.exe and the system works fine - except internet explore does not work.

work on what I have found that the internet explore failed to open, because he tried to open the files in %windir%\pchealth\helpctr\binaries

and couldn't find them - but the files are there - then it hit me %windir%, it was what I couldn't see.

so I put

CD %windir%\System32 and I reveived invalid directory

so I think that if I get the fixed variable system will be fine

so the question is

where %windir%\System32 configures itself when starting

%windir%\System32 is the directory where Windows.  Usually, this is C:\Windows but can be C:\WINNT

If %windir%\System32 is the only environment variable that is corrupted, it attaches easily... but between malware and your 'clean', several things can be damaged.

If you can get into Windows, right click on desktop and select Properties.
Click the Advanced tab.
Click the Environment Variables button
windir (without the % symbols) should be in the list.  Select it and click on edit.  If the %windir%\System32 folder is not in the list, click on 'New' and create (again, without the % symbols).  Enter the appropriate path then OK your way out.

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