Then... the comp at your home doesnt really have a good antivirus... the virus may be creeping and crawling inside your hard disk and memory... sloooowly your computer slows down... and you make a thread again, here, asking the reason and the solution... we ask you to download NOD32 and run it... and to uninstall symantec as it is a $^%%$#^(& antivirus, and you go back and try it, and post back saying "it worked, thx guys!!! digit forum roxxx" and we nod back, saying that has always been the case
I gave you a big hint on what to do next.
I luv being sarcastic
Seriously.