Login problem

I just installed a fresh copy of wp under my home directory on our department server. I do not have a mysql account there, so I resorted to use wp’s sqlite plug-in. I installed everything successfully, and I posted a few pages up there. Everything was working fine. I also changed my password for user admin. After a while, I was playing with the settings that I automatically got signed out of the website, and from then on whatever I tried I could not get back into the website. I am sure that I am typing my password correctly, but for some reason, it does not let me in. When I type my username and password, it keeps asking me for them again and again, without giving any errors or anything. I tried “forgot my password” link, it did not work, though. I also tried this link. It said password is reset, but when I tried it, it did not work either. I am really stuck. Can anybody help me with this regard please?
Thanks,
–Ali