Hi, I had this system first over 4 yrs: Intel PD35PD MB 4GB DDR2 ram Intel Core 2 2.66ghz E6? Geforce 8800 GTX 768MB GFX card 6 TB HDD Windows 7 Ultimate At the mid of 2011 when I download a video and do something else I would notice a lg in my PC. If I am installing a game or program and do something else like try to browse the internet, I would notice a significant lag in my pc. I know installing a program or game doesn't use that much resources to prevent me from multitasking. So I figured it was time for a serious upgrade. Jan. 2012...I now have this: Asus P8Z 68-VLE MB Intel Core i5 2400 LG1155 8GB DDR3 ram Geforce 8800 GTX 768MB GFX card 6 TB HDD Windows 7 Ultimate Now even with this new supposed to be faster and able to handle multitasking system, I am still experiencing slow down lags when doing more than one simple thing at a time. Downloading, installations, unzipping, watching youtube videos (some videos play like in slow motion while others play normal), all these act like they are using so much resource if you do more than one of them at a time. Can someone tell me what could be the issue(s) here? Thanks.