Hi Mike,
As far as I know the MSSQL extension and associated MS drivers are not yet ready for PHP7. I found a blog that suggested they would be ready around the end of Jan 2016, but please do not read that as a definite date.
These drivers are produced by Microsoft and therefore the people at WAMPServer have no control over these extensions.
Quick PointIt is never necessary and strongly discouraged, to put any \wamp folders on your PATH permanantly. So I would suggest removing the directories you added to your PATH.
Also remove any .dll's you added to the system32 folder as again this is not necessary and discouraged.
Because in WAMPServer we can switch between versions of APache / MySQL / PHP, If you add specific folders to the PATH or move specific dll's to folders already on the PATH it destroys this ability and will only cause confusion later.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-