My MSN won't download properly?

New msn won't download..keeps failing..gives error msg?

• I had the last version of MSN and all of a sudden when i tried to sign in the other day it stopped me and said i wouldn't be allowed to sign in unless i downloaded the new version, therefore i said okay to downloading the new version and i was prompted by a message that said there was an error and it woudln't download because it either wasn't compatible with windows vista or something like that...what should i do? this is the error msg: C:\Windows\system32\Cabinet.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the orginal installation media or contact your system administrator or the software vendor for support. ALSO, my windows update page won't load...

• Answer:

  use security program to scan your system make sure your computer is away from virus or have your computer format