Best Virtual Memory Configuration?? (slow computer)

Hey All i have several questions
1) what is the best to choose in virtual memory for computer with large memory (18 GB)?

2)my PC Start Up Very slow although i have only several applications that run in start-up, how can i improve it?

Windows Hardware:

OS Name      Microsoft Windows 7 Ultimate
Version      6.1.7601 Service Pack 1 Build 7601
OS Manufacturer      Microsoft Corporation
System Manufacturer      Gigabyte Technology Co., Ltd.
System Model      X58A-UD3R
System Type      x64-based PC
Processor      Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz, 2661 Mhz, 4 Core(s), 8 Logical
BIOS Version/Date      Award Software International, Inc. F3, 06/02/2010
SMBIOS Version      2.4
Windows Directory      C:\Windows
System Directory      C:\Windows\system32
Boot Device      \Device\HarddiskVolume1
Hardware Abstraction Layer      Version = "6.1.7601.17514"
Installed Physical Memory (RAM)      18.0 GB
Total Physical Memory      18.0 GB
Available Physical Memory      14.9 GB
Total Virtual Memory      18.0 GB
Available Virtual Memory      14.7 GB
Page File Space      0 bytes

TNX All