Net Framework Extraction Error

Well Windows Update Promoted to install Net Framework 1.1 and 2.0
well it fails obviously i try to download them manually i try to open
dotnetfx.exe
and an error occurs while extraction which says

Extracting File Failed Its Most Likely caused by low memory (low disk space
for swamping file)or corrupted Cabinet

low memory=not possible
i suspect that its a virus but i m not sure cause i runned a scan and found
nothing
anybody knows what it might be the problem with the file?
it cant even extract