Hi ;). Did you turn automatic short file name generation off (manually or using some windows tweaking tool)?
In case try enabling them back for the time of the setup.
To do this click Start, click Run, type regedit, and then click OK.
Click HKEY_LOCAL_ MACHINE.
Go to SYSTEMCurrentControlSetControlFileSystem folder.
Double-click the NtfsDisable8dot3NameCreation value, type the number 0 in the Data box, and then click OK.
On 7 try the number 2 instead of 0.
Quit Registry Editor, and then restart the computer.
Try again the setup. Please report back :thumbup:.
We should fix this in the next version :).
Edit: Post updated.