Windows 7: how many svhosts.exe's should you have??

OS windows 7 professional 64 bit
CPU intel core i7 920 (1366)
Motherboard Asus P6T Deluxe V2
Memory Corsair Dominators (TR3X6G1600C8D)
Graphics Card Sapphire 5970
Sound Card on board / Asus Xonar D2
Monitor(s) Displays lg flatron wide 22" 2x

Keyboard flico maje
Mouse g500
PSU corsair 750w
Case antec 1200
Cooling sythek mugen - 2
Hard Drives caviar black 1tb caviar green 1tb external western digital my book 1tb external western my book digital 500gb
Internet Speed comcast houstont x, 16mb down with boost. 2mb up

System Manufacturer/Model Number Alienware Aurora ALX R4
OS Windows 7 x64 (SP1)
CPU Intel Core i7-3930K (3.2GHz, Turbo 4GHz)
Motherboard Alienware Aurora-R4 x79
Memory 4x Samsung 4GB PC3-12800 DDR3 (16GB 1600MHz)
Graphics Card Nvidia Geforce GTX 690 (Stock)
Sound Card RealTek Integrated Audio
Monitor(s) Displays Dell UltraSharp U3011
Screen Resolution 2560x1600

Other Info Dell Inspiron Mini 10v (Intel Atom N270 1.6 GHz; 1GB; Windows 7 Ultimate)

OS windows 7 professional 64 bit
CPU intel core i7 920 (1366)
Motherboard Asus P6T Deluxe V2
Memory Corsair Dominators (TR3X6G1600C8D)
Graphics Card Sapphire 5970
Sound Card on board / Asus Xonar D2
Monitor(s) Displays lg flatron wide 22" 2x

Keyboard flico maje
Mouse g500
PSU corsair 750w
Case antec 1200
Cooling sythek mugen - 2
Hard Drives caviar black 1tb caviar green 1tb external western digital my book 1tb external western my book digital 500gb
Internet Speed comcast houstont x, 16mb down with boost. 2mb up