Shocks, dirt, heat, impact can all kill your computer It once was the standard opening line delivered to new students of home computing. They were told to experiment with the machine without worry because "nothing you can do will hurt it."PC user contemplates buying a Mac Q: I am a fairly active 90-year-old. I currently have a Gateway PC. My family is into the Apple and is willing to teach me "how to" if I change to Apple. Pressure is mounting. Your comments, please. Dennis BakerInstalling a video card is not hard Q: I recently purchased a new computer. It's more powerful than my old one, and I'm generally satisfied, [but] it would not run my favorite game. It has the graphics card built into the main circuit board, and apparently I need a separate video card to run my game. Can I do that myself? Scott McMillanRelocating taskbar in Windows XP not difficult Q: I use Windows XP home version. Somehow I hit a wrong key and my taskbar is now vertical on the left side of my screen instead of at the bottom. How do you get it to move back to the bottom of screen? Dale L. GaumerMany options for malware detection, firewalls Q: Regarding your recent column on malware and firewalls. Every time I think I've got a winner I either find it is lacking in one respect or causes system trouble. In years past Norton brought everything to a crawl. Zone Alarm caused problem after problem. I forget what went wrong with Kaspersky. The only one I've kept over the years has been Spybot. Currently my three home computers have a mish-mash of Zone Alarm, Commodo Firewall, Avast, AVG. What do you suggest? I don't care if it's free or not. Don Imlay