Many thanks to create a new question here!
The error might be occurred due to registry key problem. u can rectify this error:
Click Start > Run > regedit and press enter key, and try to locate the below:
From keyboard, press Delete key and click Yes to confirm deletion. Now quit Regedit.
Remember, the last key i.e. DFAD…. may change! So carefully do this. (Source from Microsoft)
CAUTION: It is good practice to take registry backup and other necessary data backup before doing anything with Registry key. You may get support from an expert for that purpose.
If you are not able to do the above, go to Start > Control Panel > Add or Remove Programs. Click to select the Office system product from the application list, and then click Remove. Now again fresh reinstall the same product. Don’t worry, it just removes the Office SW not the user files. Most probably you are trying to install File called “FileFormatConverts.exe”. If I am right, you may go for other way to convert.
If you are getting to read .docx files from Word 2003, u can go for online conversion here or convert or you may also try this.
For bulk conversion visit here.
NOTES: Make a habit to change upper version office files always Save in Word 2003 format.
Hope it helps you!