single computer log-in issue

[the bronze]

Hi, I'm a new vB user (3.8.1) and I am getting the hang of it, but I have one problem that I can't seem to solve:

When I try to register on one laptop, I cannot log-in, it just tries and puts me back at the forum homepage again unlogged in. If I use any other computers (using the same wireless or hardwired from work) I have no problems. I kinda think it happened as I was doing multiple admin tasks and then logged out of one window and logged in as a standard user for testing purposes. I cleared my cookies and such, restarted the computer (many times) and it still seems to hang there and not let me in. I am assuming it's in my laptop and not vBulletin. Has anyone seen this?

Thanks.