What's wrong with my network? Atv/SL/9.0 Nothing works?

Question

Okay so the first sign of trouble was when my wife tried to use AppleTV tonight. She was told something along the lines that the files were unreadable. I closed and tried to reopen iTunes 9.0 when I was told I didn't have permission or that the disk was locked. So, I ran disk repair from Disk Utility. I was able to open iTunes 9.0 but AppleTV was no where to be found. AppleTV said nothing was synced. After reading a number of similar posts. I delinked and tried to relink AppleTV to my iTunes. No luck. It doesn't even show up on my AppleTV when I click on network. All I can do is select "other." Then after typing in the name of the network I'm told there is a problem.
I am at my wits end. iTunes 9.0 and Snow Leopard have destroyed my computer. Between Safari crashing, FireFox crashing and a host of other issues, this latest problem with AppleTV has me ready to throw in the towel.
Any help will be greatly appreciated.
Cheers,
Paul

Answer 1

Thank you for your response. At this point I have removed both the Time Capsule and AppleTV from my system and reverted to ethernet connections. With those two items out of the system everything is fast and (so far) flawless. At this point I have no intention of going back to the Time Capsule as that has never worked well for me and performance has only gotten worse with each "upgrade."
I have Roku and will wind down my involvement with AppleTV as well. From what I have been reading it sounds like Apple doesn't have much in store for it anyway. Again, like TIme Capsule it was a product that never worked well. It was never able to hold sync for much more than 12 hours, YouTube was often unavailable and there were a series of other problems that really outweighed its worth.
It's really a shame but even the iPhone is a bit of a joke, especially if you don't live in a major metropolitan area. I am 70 miles to the north of NYC and was told by an ATT rep that I would have 3G service well over a year ago. Well, 14 months and $2.5K later in ATT bills and I don't have 3g, seldom can access my voice mail on the iPhone without calling and overall have had such a miserable experience with them that when my contract is up I cannot imagine that I will be renewing.
I have owned cell phones since 1983 (Oki was my first with 8 number memory and a transponder the size of a brief case) and I think service here in the US is an embarrassment.
Oh, and did I tell you how downloading 3.1 destroyed my wife's iPhone? The phone could no longer access wifi, anywhere. The Apple Genius knew all about the problem as he handed her a new phone. C'mon, I thought that was the stuff that MS did, not Apple!