Hi,
Try following troubleshooting methods:
Method 1:
I would suggest you to check in “Recycle Bin” for the X86 folder.
If you have it in “Recycle Bin”, then right click on it and select “restore” option.
Method 2:
If you don’t have X86 folder in “Recycle Bin”, then I would suggest you to perform a “System Restore” to the previous point before deleting the X86 folder.
Refer the following links to perform System Restore.