Hapkido

For the very first time using ESET Smart Security, it appears I have a problem with a reticent trojan. At every reboot and sometimes during regular use I get the following notifications: Threat found in memory! Operating memory >> explorer.exe(3252) Threat found in memory! Operating memory >> dllhost.exe(3076) I have no idea if this is a false positive or there is actually an infection. Can someone help me deal with this? Nothing has really changed on my system, except there were a couple of unexpected power outages which generally don't do much other than corrupt a couple forum cookies which are easily replaced. The only anomaly I seem to be having is that I can no longer download anything on any site with IE9 (Vista 32-bit system). After clicking on a download link the Download Manager opens and the file begins downloading as normal. But at the very end, the message "This program could not be downloaded". Firefox, IDM and other downloading utilities have no problem downloading files. I've run through the gamut of suggested fixes for the error message but nothing worked. I have no idea if the above is the cause or if it is even related.