I had this in another thread (TCP Optimizer ruined my connection ) so let me copy and paste: (just so you don't waste time suggesting the same things since I already tried those that were sugested to the original thread starter.)
"Ok, I also used TCP Optimizer, just like the guy who started this thread and I am having the exact same issues. The only thing different in my situation: I have cable (not DSL) and I didn't do anything else like change my firewall or add programs or anything.
After restoring the TCP Optimizer backup and it didn't work, I deleted every trace of TCP optimizer (including the backup file) and scanned my computer with Ad-Aware and everything. I also downloaded winsockfix.exe after reading this thread and that also did nothing.
I have two laptops at my house. If I only use the one that didn't have TCP Optimizer on it, everything is fine. It's only when I boot the other laptop (that had the Optimizer) and connect to the internet, then I have about 5 minutes before the connection is screwed - not just on that one computer but for both laptops. This is why I assumed something was being reconfigured with the router. I unplug it and plug it back in and then the connection will work again for five more minutes, and so on and so on.
Also, like the guy who had this similar problem - after my connection has been fried, although I can't pull up any web pages or anything, I have noticed that when uTorrent is open it is still uploading torrents at a pretty normal rate. So, it seems I am not completely disconnected.
I knew what my router settings were before TCP Optimizer because I had recently installed firmware and had been working with it a lot and had become familiar with the settings. Thus, after deleting TCP and resetting my router to the factory defaults, I was able to restore it just from memory ... but still, I have the same problems post-Optimizer. Everything was really fine before - I just thought I could tweak the speed with Optimizer to help my torrent downloads. Big mistake. It's like it sends a signal after being online for a few minutes and resets my connection settings and the whole thing just overloads.
Please, please help.
I really don't want to have to install other programs to fix the problem if i don't have to and I am REALLLY opposed to putting TCP Optimizer on my computer again in any form.
(my router is a Linksys and the firmware I installed was DD-WRT. both were fine before Optimizer.)"
I got this response:
Ok... I am using Windows XP ... I use a wireless router - a Linksys WRT54G v4 and I installed DD-WRT v.23 and it was working fine. I use Comcast as my provider.
What other info do you need?