"invalid digital signature" and "file curupt" when I open file

[russhyldon]

Hi everyone,

Im having a total nightmare with my laptop, Ive had it for about a year and for some reason whenever I tried to download files/applications it would come up "curupt file", after a very long time trying to look for answers, i decided to save all my files and I used system restore and wiped everything off my laptop and restored the laptop to "factory settings".
After doing this I tried to download firefox and then "invalid digital signature" poped up underneath the download, so i ran the file anyway and "curupt file" appeared.
I tried downloading google chrome and the same thing happend, its happens to everything now that i try and download.

I could really do with some help on this as no one seems what I can do, also I was toled to try and download mulwarebytes, but everytime i try and download it the same things happens.

i hope someone can help me.

 

[davcon]

command prompt sfc/scannow
run as admin
or run the repair utility.

 

[mcnumpty23]

try booting into safe mode with networking to see if it does the same

tap f8 during bootup and select safe mode with networking--not just safe mode