did you try turning off DEP
Right click on My Computer
Click on Properties
Click on the Advanced tab
Click on the Settings button in the Performance section
Click on the Data Execution Prevention tab
This is for XP, for Vista or 7 open a command prompt with admin rights and type:
bcdedit.exe /set {current} nx AlwaysOff
reboot your machine and try again

if you want to check your DEP status, open a command prompt and type
wmic OS Get DataExecutionPrevention_SupportPolicy
if you get a 0 as a reply it's turned off, 1 is on, 2 is on for services specified and 3 of off for services specified.
Let me know how it turns out

-D