The computer in our college boot very slow, the welcome screen appear for around 3 minutes. The computer configuration is 40 gb HDD, 128mb ram, running on windows XP pro with sp-1. Two weeks back the computer was infected with over 300 viruses which I got cleaned with McAfee. Everything seems fine now but it takes very very long time to boot and start the computer. I have done most of the XP tweaks like disabling unused services, auto-update, start-up items etc but to no avail. Please help.