Download the recovery disc - gives you the system recovery options. ( get the same bit version , 32 or 64 as you currently have installed )
Windows Vista Recovery Disc Download — The NeoSmart Files
( might be in be in German - select your language at the first screen that pops up where you select Language and keyboard) )
Vista Recovery-CD Downloads Systemtools - Go Windows Vista - Forum News Hilfe Board-
When it has found the installed o/s , click Next
Click the command prompt, type notepad, press enter.
Notepad pops up - click File then click Save.
Navigate to the drive - rt click it , select Properties.
Untick Compress this Drive, Apply, OK.