Vista - Windows Live Messenger 8.5 will not update.

Hi everyone, I opened WLM 8.5 this morning to see that it was offering an update, I heard it was for WLM 2009 but I can't confirm that because I haven't seen it, as it wont' update.

It'll go up to 99% then it will roll back.

Here's the error;

A network error occured while attempting to read from the file: C:\Windows\Install_[508CE775-4BA4-4748-82DF-FE28DA9F03B0].msi

I've tried everything I could locate, which wasn't much, just a few sub par KB articles that don't directly address the issue and send you an epic circle of 'check this article'.

Has anyone seen this before and happen to know a firm solution for it? This is the only program doing this, I removed and reinstalled a few apps, a few of them MS ones as well to test, only Windows Live apps have this problem.

Thanks.