Moved to VSE for better attention.
Have a look at this: ( https://kc.mcafee.com/corporate/index?page=content&id=KB51111 ). About half down the document is a description of Windows OS' supported with each version of VSE.
Note: Windows NT SP6a may not support the current CMA provided in VSE v8.7i or v8.8. So, you may need to use an already depricated and un-supported v8.5.