As your title suggests you may have an infection or two.
My advice would be to download HijackThis from here click here
This is a zip file so you need to unzip this into a folder of its e.g C:\Program Files\hijackthis
Open hijackthis and click the button 'Do a system scan and save a logfile' this will then save a notepad logfile for you , next copy and paste the logfile into the 'Malware removal' forum at this site click here
This site specialises in reading these logfiles and they will be able to help you with any infections that you may have.