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Just one follow up to your reply ......can I expect the upgrade to remodel the registry and therefor fix the original problem that a MS tech could not fix.
FYI ....the problem was an error message that i was getting on boot up ...."The NTVDM CPU has encountered an illegal instruction". THis error message was preventing me from getting MS security updates.
Once again ...how can I be absolutely sure this is an "upgrade disk". It says on the disk "Replacement Disk" ..and then says ..."includes Windows Anytime Upgrade". None of this seems conclusive. However most "install" disks" do have a warning on the disk saying data and files will be erased from hard drive" This one has no warning .......Does any of this sound conclusive to you? .......Thanks again!
The MS tech (paid $100 for the effort) did many things. Yes he checked for malware etc and worked in my registry and did an "SFC Scannow"
My internet connection is good .....but cannot connect back to you