Flash9f.ocx and Access Denied when attempting to delete second Operating System Windows XP Professional

For reasons too numerous to go into, I now have two Windows XP Professional O/S installed on the same partition, thanks to bad advice from someone I paid to fix my computer. The original XP is installed in C:/WINDOWS.  The second XP is installed in C:/WXP2. I understand what I am seeing when, at startup, the two O/S's are listed, and I know which is the "old" one (supposedly virus-laden) and which is the "new" one, intended to give me a fresh start without viruses. And I understand about editing boot.ini to remove the line for the old O/S. So far so good. But the expected results did not happen. The techie I paid said that it would be a simple matter for me to delete the WINDOWS folder, edit the boot.ini, and have only one fresh installation of XP. (BTW, the reinstallation CD for the XP that came with the computer was used for the second installation.) What I have experienced is that some programs that remained installed in C:/PROGRAMS has had to be reinstalled while working in the new XP in order to be accessible through the new O/S. Okay, I can live with that even though it has meant digging up product keys and serial numbers and sometimes contacting the software mfgr. on-line in order to get these numbers and retrieve access to the full version of a program instead of a limited or trial version. The Number One problem is that I cannot delete C:/WINDOWS folder. I attempt to do so from within the new O/S. Every time, action will appear to be occurring on-screen then the deletion will stop and a message box will open:  Cannot delete Flash9f.ocx. Access denied.  I know this forum has several answers to this non-deletion glitch but none of them address my exact issue.

I have gone into the Registry of both O/S's, done a search for Flash9f.ocx and changed the value to "value not set."  I have done all the usual things I can think of to delete this file, found in C:/WINDOWS/system32/Macromed/Flash.  Flash9f.ocx exists only in WINDOWS (the old O/S). It does not exist in the new O/S.  Adobe Flash Player and/or anything Macromedia does not exist in the Add/Remove Programs list in the old O/S. There are other minor things that I have done as workarounds to remove the folder C:/WINDOWS and none have worked. The deletion stops when the file Flash9f.ocx is encountered.  Even if I were to able to delete Flash9f.ocx, I have to wonder whether the deletion process will encounter yet another file with Access Denied which will halt the process.  Why do I want to delete C:/WINDOWS ? Because it's there, because it takes up space, because I don't need it -- the new O/S installation is working glitch-free, and because -- since there were virus problems with the old O/S which the techie couldn't resolve -- I would think that the presence of the old O/s could cause problems later on. Better to get it out of there but how?

Thank you, experts, for reading my possibly too lengthy question.