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Left 4 Dead Laggy On My Computer?

I have more than what the game recommends for decent gameplay tho These are the specs of my computer (I have a HP Pavilion DV7-1137US) General Recommended Use Home use Platform Technology Intel Centrino Built-in Devices Stereo speakers , Wireless LAN antenna Width 15.6 in Depth 11.2 in Height 1.7 in Weight 7.7 lbs Localization English / United States Notebook type Desktop replacement (7.5 + lbs.), Budget Screen type Wide-screen , High-gloss/Anti-glare screen Wireless capabilities 802.11a, 802.11b, 802.11g, 802.11 pre-N Processor Processor Intel Core 2 Duo T5800 / 2 GHz Multi-Core processor technology Dual-Core 64-bit processor Yes Cache Memory Type L2 cache Cache size 2 MB RAM Installed Size 4 GB / 8 GB (max) Technology DDR2 SDRAM RAM form factor SO DIMM 200-pin RAM configuration features 2 x 2 GB Storage Controller Storage controller type Serial ATA Storage Controller / Serial ATA Interface Serial ATA-150 Storage Hard Drive 250 GB - Serial ATA-150 - 5400 rpm Hard drive type Portable Optical Storage Type DVD?RW (?R DL) / DVD-RAM Disc Labeling Technology LightScribe Technology Optical Storage (2nd) 2nd optical storage type None Card Reader Card reader type 5 in 1 card reader Supported flash memory cards Memory Stick , MultiMediaCard , SD Memory Card , XD-Picture Card , Memory Stick Pro Display Display Type 17 in TFT active matrix Max Resolution 1440 x 900 ( WXGA+ ) Widescreen Display Yes Features BrightView Video Graphics Processor / Vendor Intel GMA 4500MHD Dynamic Video Memory Technology 5.0 Total Available Graphics Memory 1759 MB Audio Audio output type Sound card Audio Output Features Altec Lansing speakers Audio Input Microphone Notebook Camera Camera Type Integrated Multimedia Functionality TV Tuner Type None Input Device(s) Input device type Keyboard , Touchpad Telecom Modem Fax / modem Max transfer rate 56 Kbps Networking Networking Network adapter Networking / Wireless LAN Supported Yes Wireless NIC Intel WiFi Link 5100 Data link protocol Ethernet , IEEE 802.11a , IEEE 802.11b , IEEE 802.11g , Fast Ethernet , IEEE 802.11n (draft) Networking standards IEEE 802.11a , IEEE 802.11b , IEEE 802.11g , IEEE 802.11n (draft) Expansion / Connectivity Expansion Slots Total (Free) 2 ( 0 ) x Memory - SO DIMM 200-pin , 1 ( 1 ) x ExpressCard/54 Interfaces 1 x Network - Ethernet 10Base-T/100Base-TX - RJ-45 , 4 x Hi-Speed USB - 4 pin USB Type A , 1 x Display / video - HDMI , 1 x Storage - ESATA - 7 pin external Serial ATA , 1 x Display / video - VGA - 15 pin HD D-Sub (HD-15) , 2 x Headphones - Output - Mini-phone stereo 3.5 mm , 1 x Microphone - Input - Mini-phone 3.5 mm , 1 x IEEE 1394 (FireWire) - 4 pin FireWire , 1 x Remote control - Infrared , 1 x Docking / port replicator Miscellaneous Included Accessories Remote control Features Power-on password , Security lock slot (cable lock sold separately) Power Power device form factor External Battery Technology 8-cell Lithium ion Installed Qty 1 Operating System / Software OS Provided Microsoft Windows Vista Home Premium 64-bit Edition Software Microsoft Works , Muvee autoProducer , CyberLink DVD Suite , AOL Instant Messenger , HP QuickPlay Software , HP Smart Web Printing , HP Total Care Advisor , HP Photosmart Essential , HP Help and Support Center , Microsoft Internet Explorer , Norton Internet Security 2008 (60 days subscription) , Microsoft Office 2007 Student and Teacher Edition (60 days trial) But yet left 4 dead still seems laggy during gameplay, and whenever i minimize it it won't let me re-open it unless i close it and then restart the game. i'm also pretty sure viruses, or anyother malware is the problem because i've checked for viruses and etc, and my computer came up clean. So can someone help me??

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