hi,,, who said you have 113 virus entries????
and how do they know by looking in the prefetch ????
if you have downloaded some software thats showing 113 nasties after a scan and now wants you to buy it to get rid of these nasties,,,,, then dont sa its a con,,, known as scare ware,, scares you into parting with your money,,,,,
download this FREE scanning tool,,,, its one of the best there ishttp://www.malwarebytes.org/mbam.php
blue tab for free version,
and how to use it belowhttp://www.udel.edu/topics/spyware/malwarebytes.html