I have problems when I want restart the system after a standby mode (suspend mode) 
My BIOS is managing several options (S1 (POS Only), S3 and AUTO.  And
I have this problem whatever the option is.
The system is resuming immediately (1 or 2 second) after I press the
resume button.
On restart, the system is also wake up immediately in 1 or 2 second, 
The desktop screen is displaying normally:
- The mouse is active
- The network icon indicate that there is no connection available 

As soon, I launch any application, the system freeze

I have already made the following test without success: 
Disables the network connection nor disables the antivirus 


Configuration: 
Motherboard: ASUS P5AD2 Premium (bios up to date, release 1010)
NVIDIA 6800   
XP PRO up to date with SP2 
Norton Internet security

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Clarification of Question by manuforum-ga on 22 Apr 2006 00:49 PDT

i have done additional tests : 

Dumppo exe give me the following informations 
Power button present : Thrue
Sleep button present : False  
Lid present : False 
System states suported : S1 S4 S5

Bios parameters : 
Test 1 : On resume with option S1, the system hibernate but the
ventilator remain active, on wake up, i still have the same problem
(mouse & keyboard active, system freeze)

Test 2 : On resume with option S3, the system hibernate, the
ventilator is innactive, on wake up still the same problem (mouse &
keyboard active, system freeze)

the standby mode that i want is the standby with the power loss. this
standby seams to be the S4. My motherboard give me 3 options S1, S3 &
auto

I therefore conclude that my motherboard does not support
this status ?  

thank for your comments

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Clarification of Question by manuforum-ga on 22 Apr 2006 01:14 PDT

I have made an error on my last comment. 

the dumppo informations are linked with the bios parameters. i
reexecute Dummpo with S3 in the bios status and now the DUMMPO exe
give me these availables status

System states suported : S3 S4 S5

SO MY MOTHERBOARD CAN support the standby function : GREAT !! 
but how ? 
thank you

Check the log files

control panel -> administrative tools -> event viewer.

sometimes a drivers waking it up.