Application NEro8 Not getting Repaired in vista

hi all,
My application Nero 8 is giving an error in Repair in Vista OS. The repair works fine in XP OS but when i am
trying to repair the same application in Vista it gives me an error saying that "Installer stopped prematurely". when
i looked into the log for repair i found the following lines during the Installfiles standard action which as giving
problem:

MSI (s) (1C:54) [05:44:27:494]: Internal Exception during install operation: 0xc0000005 at 0x000A83FC.
MSI (s) (1C:54) [05:44:27:494]: WER report disabled for non-console install.
MSI (s) (1C:54) [05:44:27:494]: Internal MSI error. Installer terminated prematurely.

when we look into services the windows installer service is terminated.....also even if we restart it the same error occurs during the next repair of the same application....

actually it gives this error during installfiles(I am sure about this because i have tried by commenting the installfiles action and it did not through any error) standard Action ....we found out
on the internet that it is related to digital signature checking inside For the external cabs(not sure though) which happens only in vista.....but not able to find out why this exception is coming and for which cab it is coming.....
Also i have tried the following things:
1.) removed all the assemblies.
2.) Removed all the services and system32 files.
3.) made component attribute for all the component as "do not overwrite" so that none of the files are in use during repair.

All the above solutions did not work....

Anybody has any idea regarding this. any help would be appreciated.

Thanks and Regards

Sidharth