Windows Vista wont allow install and downloads

[sameh83]

I have a fresh install of windows vista 3 days ago. Ever since,,,CERTAIN downloads would install and some would not even download. I am bewildered at the reason WHY this would happen. Like i said,,,some programs does download and install and some would download ONLY, and some would NOT download OR install at all ! I get a different message everytime,,previously,,,i got this message,,"Directory not found", and "Data not found", but the messages always change.

Things i ALREADY did,,,

SFC /SCANNOW
Checked UAC settings
(ran everything with Admin privelages)

 

[sameh83]

Helpppppp pleaseeeeee