There are many free anti-spyware or anti-malware utilities you can download and install on your computer to check for spyware infections. Some do a better job than others in finding and cleaning infections off of your computer. It's always a good idea to run more than one utility to make sure you do the most thorough scan you can since some programs will find items that others won't. Trend Micro is well known for their antivirus and anti-spyware software and have some effective products you can buy to protect your computer. They also offer a free scanner that you can download and run on your computer to check for infections.
The Trend Micro Anti-Spyware HouseCall Scanner is a free online tool that checks computers for spyware, and helps remove any infections found. When the detection process is complete, the tool will display a report describing the result including which if any, spyware were detected, and prompt you before the removal process so you can review the infected items it found to make sure it didn't find anything that you don't want removed.
Once you download and install HouseCall simply run it to see if it finds any infections that need to be cleaned.
Supported Operating Systems: Microsoft Windows 32 & 64 bit versions