First you want to update and run all of your antispyware and antivirus programs. If you don’t have any there are many legitimate free programs on the net. You can identify them by the number of reviews, and recommendations from other users. After installing and scanning you will most likely find the files that are infected.
Follow the instructions of the software to completely remove or quarantine any programs or files that are infected. This should remove all threats, but it is often a good idea to run a second scan, and also after that you may wish to run a register cleaner, just to be sure that everything is OK after removing the files. Finally, you should also contact your bank or credit card company to advise of the problem.
Learn how to remove spyware