I tried to install Ubuntu 11.10. I ran the Wubi.exe and it installed everything, at the very end, it said:
An error occured:

Error executing command
>>command=C:\Windows\sysnative\bcdedit.exe/create/d Ubuntu
/application bootsector
>>stderr= The boot configuration data store could not be opened.
The system cannot find the file specified.


For more information, please see the log file:

After that i read several threads about this topic, but i didn't find a solution...

I'll give you some information of my computer:
Windows 7 Home Premium
Service Pack 1
Processor: Celeron Dual-Core
CPU T3500
2.10GHz 2.09GHz
Ram: 4.00 GB
64-bit Operating System

I hope i will get a solution fast...