can't load newer version win95

I attempt to load my cd-rom version of windows 95 but can't.
I tried the autorun and it goes through the wizard, then I am presented with a message: "Warning SU0168  Your computer has an operating system installed which cannot be upgraded (to this newer cd-version) of setup.  Please obtain the windows 95 upgrade."
The whole disk then shuts down.

I also tried from DOS, without success.

I presently use a backup of the preinstalled system which is not complete since there was a problem with the system when the backup was made.  The problem was rectified but unfortunatly software preinstalled or not was not covered.
Cannot load from format disk,then install cd-rom (another problem for another day)as I load cd-rom driver but not recognized by cd player so must work with present backup system.

System: bondwell 6150 mpc
686
1 gig

Thanks in advance,
exodus
exodusAsked:
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exodusAuthor Commented:
Edited text of question
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jvolenceCommented:
OK, I have an answer to your question.  You have the FULL version of Win95 on that CD.  The FULL version will NOT install if you already have an operating system on your drive.  Delete (or rename) your windows directory, or format your hard drive and install from scratch (which is the best way to install windows 95 anyway).  If you decide to not format your HDD, you have to delete or rename the following files:

c:\io.sys
c:\msdos.sys
c:\<windir>\win.com (<windir> is where you have windows)

If you decide to format your hard disk, backup everything that you don't have copies of (ESPECIALLY YOUR DOS CDROM DRIVERS! (mscdex.exe, and your cdrom driver that's loaded from config.sys)), and then copy your DOS CDROM drivers to a bootable floppy disk, and then format your drive. Then boot to the floppy, load the CDROM drivers, and run setup.  I know it seems harsh, but the FULL version of Windows 95 (which you have) must be installed either to a clean HDD, or a HDD that it thinks is clean.
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exodusAuthor Commented:
Thanks, this is the best answer I have gotten so far.  Since I cannot load from cd-rom,if I format the hd, I will try and rename the above.
Again, Thanks,

-Freedom-1
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jvolenceCommented:
I am not sure if the renaming will work, as I have only worked with this sort of problem by reformatting the HDD and backing up all data.  I know Windows searches for some certain "system" files to know if there is another OS on the PC already.  I know those are crutial system files, so try renaming or deleting those, but other than that, I'm not sure what else it could be looking for.  I wish you luck!
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