Problème démarrage très long dual boot

Bonjour,

Mon ordinateur met énormément de temps à démarrer (environ 10 minutes)
J'ai tenté beaucoup de choses proposées sur le forum mais rien ne fonctionne.
Je suis en Dual Boot LInux / Windows 7

Détails sur l'ordinateur :

système d'exploitation : Windows 7 Ultimate (build 7600)

Processeur : Processor a Main Circuit Board b
3,00 gigahertz Intel Core2 Duo
64 kilobyte primary memory cache
4096 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded

Drives new - drive encryption Memory Modules c,d
738,06 Gigabytes Usable Hard Drive Capacity
554,75 Gigabytes Hard Drive Free Space

_NEC DVD_RW ND-3500AG ATA Device [Optical drive]
Lecteur de disquettes [Floppy drive]

Hitachi HDS721010CLA SCSI Disk Device (1000,20 GB) -- drive 0, s/n JP2940HQ2STKGH, SMART Status: Healthy
Lecteur de disque [Hard drive] (320,07 GB) -- drive 1

? Adaptateur USB DWA-110 D-Link sans fil G #2
primary Auto IP Address: 192.168.1.2 / 24
Gateway: 192.168.1.1
Dhcp Server: 192.168.1.1
Physical Address: 00:24:01:9B:F2:F4
Connection Speed: 54 Mbps
Carte Microsoft ISATAP
? Microsoft Virtual WiFi Miniport Adapter #2
Status: Not connected to a network
Dhcp Server: none responded
Physical Address: 00:24:01:9B:F2:F5
? NVIDIA nForce 10/100/1000 Mbps Ethernet
Status: Cable unplugged
Dhcp Server: none responded
Physical Address: 00:1D:60:88:22:CB
Teredo Tunneling Pseudo-Interface

Networking Dns Server: 192.168.1.1

Main Circuit Board b:

Board: ASUSTeK Computer INC. P5N-E SLI 1.XX
Bus Clock: 333 megahertz
BIOS: Phoenix Technologies, LTD ASUS P5N-E SLI ACPI BIOS Revision 1406 11/18/2009

Memory Modules c,d :
2048 Megabytes Usable Installed Memory

Slot 'DIMM_A1' has 1024 MB
Slot 'DIMM_A2' is Empty
Slot 'DIMM_B1' has 1024 MB
Slot 'DIMM_B2' is Empty

Local Drive Volumes new - volume encryption


c: (NTFS on drive 0) * 56,48 GB 6,37 GB free
d: (NTFS on drive 0) 262,14 GB 162,69 GB free
e: (NTFS on drive 0) 419,43 GB 385,69 GB free

Display :
NVIDIA GeForce 8800 GT [Display adapter]
Samsung SyncMaster [Monitor] (22,0"vis, s/n ME22HS3P302106, mars 2007)

Multimedia : Realtek High Definition Audio

Voilà le descriptif.

J'attends vos suggestions. Merci