Since I had a Trojan removed using Microsoft Security Essentials my computer seems to boot up with a black screen and slower than before. It also is slow to come out of sleep if I leave computer for a bit and has the black screen also. Could this be the result of removing the Trojan or is the black screen may be normal? Also MSE did not find the Trojan until I managed to force shut down and restart and then I did a custom scan of the network and some other files. Is that typical of this type of Trojan to not be stopped before locking up the computer?