Problem with anti cheat for CS source

Isn't Source's anti-cheat VAC; the same as all Valve/Steam distributed games? I just googled acdev.sys and found nothing that would indicate it's part of any anti-cheat software. I'd run a virus scan.
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Mouse
    Logitech G5
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500
Have you tried disabling driver signing on Vista? That might be causing the problem.
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Keyboard
    Logitech G11 Keyboard
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card
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