Now let's come to the issue of protection..I noticed that you don't have any antivirus running..please don't assume that Microsoft Antispyware or Ewido would be replacements for an antivirus, they are not..here's a couple free ones you can try..pick one..(don't use more than one)
Visit Windows Update regularly to get the latest security updates.You can also enable automatic updates.Your antivirus software and antispyware programs should also be updated regularly. Make a habit of running scans on a timely basis. Be careful about what you download, scan every file before clicking on it.
Additional programs to consider:
Spywareblaster Prevents the installation of ActiveX-based spyware, adware, browser hijackers, dialers, and other potentially unwanted software.Blocks spyware/tracking cookies in Internet Explorer and Mozilla/Firefox.Restricts the actions of potentially unwanted sites in Internet Explorer.
Adds a list of malicious sites to your Restricted Sites Zone.
A good article to read:
So how did I get infected in the first place?