I stupidly downloaded some software from what I assume was an unreliable source. For some reason my McAfee didn't intercept and I'm pretty sure I have a vicious virus. I now can't open any programs including McAfee, IE etc. The ones that do open freeze or just stop responding. When I click End Program, the screen does not always repopulate with program icons, just my screensaver. It is a nightmare. Help please! I should point out that I will need my hand held all the way as I have virtually no technical knowledge.