computer freezes when other computers access files

[freakyhair]

Hey all,

I recently installed Win7 Ultimate on the computer in my sig. I was running Win 7 RC before that for months. I have most of the folders on my second HD (1TB green WD) shared. Now, when another computer in my network tries to download a file from my computer, my main computer freezes. Usually not immediately though. so the other computers can browse, and sometimes get small files, but anything big (movies) will certainly freeze the computer (no BSOD, just freeze.)

This didn't happen when I was running Win7 RC. Is there some setting I may be missing?

Thanks!