Yesterday my friend sent me a link and I clicked on the link. The computer gave me a warning about it being harmful but since it always does that I allowed it to open the link anyway. The link was immediately detected by my antivirus and quarantined. I logged off the computer but now everytime I try to use my account there is only a black screen and a cursor nothing else. It stays there for hours. But if I use another users account, everything works properly. Please help, there are several documents that I need to access in my account as its the only admin account on the laptop.
Run an effective antivirus boot-time scan, which should remove any malware. You do not state what antivirus you're using, but if it doesn't fix the issue, try another, such as Kaspersky free scan: http://free.kaspersky.com/, Malwarebytes Free: http://www.malwarebytes.org/lp/malware_lp_form/, or Avast! Free: https://www.avast.com/en-us/index.
Do not install two real-time antiviruses as they will conflict with each other, but Malwarebytes and Kaspersky can be set to run only upon request.
Though you can install and run the AV software from the other account(s), to be most effective, you might need to make a bootable USB device with an antimalware applications. See http://pcsupport.about.com/od/system-security/tp/free-bootable-antivirus-software.htm for a list. The virus definitions become outdated, so use a newly-made tool.