wp-login.php and wp-admin – '&reauth=1'

Dear WordPress users,

I’ve got a blog for 3 years running on a webhosting. But when i go to domain.nl/wp-login.php I get in an ‘unstoppable loop’, i tried on several computers in Mozilla Firefox, Google Chrome and Internet Explorer.

When i try to surf to domain.nl/wp-admin/ than i receive a search resultpage and the keyword is: ‘&reauth=1’.

At my android phone i had already installed the WordPress app, on the app it works fine! I tried a upgrade with clean files from this website but it still doesnt offer me a solution. Refreshing the keys in wp-config doesnt help me, adding Site URL and Homepage URL neither.

Could anyone offer me a solution!

Thanks in advance!

[Moderator Note: No bumping. If it’s that urgent, consider hiring someone.]