Lost Plugins Menu

Earlier this evening I realised that I had been hacked. My site and all data appear fine, the hacker had just put a looping music track and photo on the main page.

I’ve followed all the steps dealing with hacking from checking files, changing all my passwords to running malware and virus checks etc.

I’ve also had my webspace provider roll back the site to a time before the hacker got in.

However what I have noticed is that for some reason my ‘plugins’ menu has disappeared, the ‘updates’ button under dashboard menu has also gone though it is visible on both my other admin panels for other sites that haven’t been hacked.

Has the hacker done this? It looks like he has also changed my log in name from ‘admin’ to ‘salam’ (though obviously i’ve changed the password).

Will I need to do a complete reinstall to get these menus back? Or is there another way around this?