Patching problems...Help!

I'm getting a error called:

Patch system error (result code -30):

Unable to move/rename a file (access restriction or or read-only).

Can anyone help me find a fix? Thanks!

I learned something new, and it's a Catch-22...

Patching kept taking forever, and stalling.  Partly due to needing to defrag (I suspect Vista's defragmenter kinda sucks), but here's the other part:

If I go into the Windows Task Manager (Ctrl + Alt + Delete, choose "Start Task Manager"), then click the "Processes" tab to see what Processes are running....Matrix.exe is listed at the bottom Priority level:  "Low".

You can raise it to "High", and things still seem to run better, but I'm both baffled and annoyed that a program launched by a user becomes the least important thing to keep running.

So, the Catch-22:  Kybutra's excellent suggestion of running the file as Administrator (which solves a lot of ills).

When you do that, I still find the game at the bottom Priority....but this time when I go to raise the Priority level, I get "Access Denied". 

Even if you're logged onto an Administrative account in Vista, you still lose the battles with anything you launch as Administrator.  Because Vista dynamically raises and lowers your privileges based on what it thinks is safest for the machine.  When the program is launched "in an Administrative context", it's constantly raised to Admin....and you are not.

Any ideas on how we might have our cake and eat it, too?   I'd kind of like to be able to Administrate files I run as Administrator, under my Administrative account, instead of getting my knuckles rapped and told, "U can't touch dis"

Tip one: don't raise the priority of any process above "Normal" unless you really know what you're doing. putting it at "High" will actually stop stuff that needs to run from working on your PC.
Tip two: if you have windows Vista and you use an administrative account, you can turn off the constant authorisation prompts (the User Access Control or UAC) from the "Users" control panel.

I must admit, with my own patching problem I had reached a certain point of aggravation...and tend to shut down every last non-critical program or service before I raise the game.  Just the same, I find I can still stay (relatively) stable in High...my taboo is never to try "Realtime" (I guess at least I know that much ).  It was just very annoying to see the game run at "Very Low" priority, even after I'd launched and was running in Windowed mode.  If the user has engaged an active window, that active window should be the priority, barring necessary background services.  I can't accept that the background services devoured every last little resource and I had all the overhead of Notepad left for MxO.  Not with a machine that hits 5.0 on the WEI.

Phi is correct--you can truly mess things up if you don't know what you're doing (and I should have said so...or just plain not mentioned Priorities and Services at all).  I should state that I specifically push, prod, and then format and re-do this machine of mine for the express purpose of conquering Vista.  I wouldn't try crazy crap like I've posted on other threads, using a machine I depended on...