I've been experiencing occasional net slowdowns about a month ago, then it stopped happening, and a few days ago it came back. It just slows everything down, I have to refresh pages a couple of times (depending on the size) to completely load, and sometimes it totally blocks whole net. Another thing I've noticed when that starts happening: Windows Firewall asks whether to block or unblock Firefox (didn't try other browsers, and I never use IE). I'm pretty sure this is a conflict between some software or something like that because I'm totally paranoid about getting infected, I don't even visit Wikipedia outside of Sandboxie. I don't use P2P programs (never did, never will, thanks), and everything I download, I get from official pages (mostly freeware, only known software most people have heard of), and I submit every single file to VirusTotal before I run it. However, I wasn't this paranoid when this first happened. Also an interesting fact, I don't remember this happening before I installed Comodo firewall, so I'm 99% sure it's some software conflict. I'm pretty sure I'll uninstall AVG LinkScanner because it slows down the net (only reason I keep it is because it once saved my butt from vundo). Now back to my problem... When the slowdown starts, I've tried everything (ipconfig with all options one by one and repairing wireless connection - yes I use wireless) and nothing helps except for a simple reboot. When I reboot everything works again like a charm. This problem happens like 0 or 1 times a day (never more, that means it's rare). Also I've noticed that it starts happening after a specific period of uptime. Logs are all clean (one tracking cookie, HJT seems fine to me, MBAM log is in Croatian but it's clean). Looking at HJT log, you will notice many entries related to Lenovo or Synaptics. It's because I'm using a laptop with preinstalled Windows. I'm not sure if this is the right section to post this but I couldn't have found anything more appropriate. If it's in a wrong section, a mod should move it. Thanks. Another thing: when that slowdown starts happening, MSN messenger isn't experiencing any problems (always works; I didn't try re-logging in) and I have a hunch that IE would work (not sure). Any suggestions are welcome.