Greetings All, I just purchased this new Presario v2552us Notebook. http://www.compusa.com/adproducts/product_info.asp?product_code=336300&pfp=cat3 I have a couple of questions. 1. On my home PC I run AVG free virus protection, MS Defender spyware and Zone Alarm fire wall. Do I need to run these on the laptop as well? 2. If I want to buy more ram, is this the right one? http://www.compusa.com/products/product_info.asp?product_code=50206549&pfp=BROWSE Can I install it myself? Thanks in advance.