Help with installation

I've just installed MikTex 2.9 on my new computer.  I used to run 2.8 
routinely with no problems.  But now I have problems.

I'm working with a very simple file, which used to compile fine under 
2.9  When I first load the file, I get a .pdf window as usual.  I make a 
change, and recompile.   I got a message that i was missing a certain 
package.  (But I can't tell you what that package was--you'll see why in 
a minute.)  So I asked TexWorks to download that package.  Good.  It did 
that.

I compiled again, and I get a message:

texify.exe: Permission denied: similarity for kids.log  (THe name of my 
file is 'similarity for kids')
texify.exe: Data: similarity for kids.log.

What is going on?  I am a relatively naive user, so if you can explain 
this--or what to do--please be patient and use very simple terms.

Thank you!

Mark Saul

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