trojan.maljava and maljava!gen25

Hi I have had a problem with my system had 2 detected hit through the NIS anti virus scan first was trojan.maljava on the 1/12/12 this was quarantined and did not affect the performance of my system the 2nd was on the 18/12/12 and was trojan.maljava!gen25 and this was quarantined to but this has hit IE9 where it makes it hard to browse due to the speed that it loads web pages I have reset my web browser but this has had no affect I have used NPE this says the system is clean. So I am now looking for the next step to be able to us IE again with out the slow load

thanks for your time