Is this a good computer for gaming and video editing? (check description)?

My Components
Intel® Core™ 2 Quad processor Q6600 (8MB L2, 2.4GHz, 1066FSB)
Genuine Windows Vista® Home Premium Service Pack 1
Microsoft Works 9.0
1Yr Ltd Hardware Warranty, InHome Service after Remote Diagnosis
Dell S1709W 17" Widescreen Flat Panel Monitor – Now Save
4GB Dual Channel DDR2 SDRAM at 800MHz (4 DIMM)
500GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache™
16X DVD+/-RW Drive
ATI Radeon HD 3450 256MB supporting HDMI
Integrated 7.1 Channel Audio
Dell Entry Keyboard and Dell Optical USB Mouse
Dell 19 in 1 Media Card Reader
No Modem Option
Internal PCI 802.11g Wireless Network Card

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