sysinternals process monitor fast io disallowed

Set Steam.exe entire folder to 'trusted file(s)' in Comodo (=> didn't change anything) Portforwarded all necessary ports for steam (=> didn't change anything) Deactivated my Comodo Firewall and Avira AntiVir (=> didn't change anything) Used HotSpotShield to circumvent the problem (VPN to connect) (=> didn't change anything) Tried WinFixIt (or something like that) - updated again via Windows Update (=> didn't do anything) Don't have the possibility to run wired instead of wireless, so. Tried to fix the registry entries, concerning offline mode (=> already set to 0 didn't change anything) Since I didn't have a system restore point. Copying the Steam folder (except SteamApps) from another PC (which could connect just fine) (=> didn't fix it) Again, reinstalling Steam at this point (=> didn't fix it)

Updating WLAN drivers manually (=> didn't fix it, rolled it back ) checked steampowered's list for possibly interfering programs that I might have installed (=> deleted a few, but didn't expect the problem to change, since I didn't install anything around the time, when the problem first occurred) (see above): Updated via Windows Update (=>125 updates and several reboots later, the problem still occurs) Checked update history (WLAN drivers?) (=> not updated - in fact, I had Windows Update turned OFF, the entire time)

De-installing Steam, rebooting PC, reinstalling Steam (=> Updated fine, but error messages keep popping up) Deleting all files in the Steam folder, but Steam.exe + Backup of SteamApps (=> Updated fine, but error messages keep popping up) Resetting both internet connection and PC (=> Changed nothing) Logging in to (=> Yup, changed nothing, though) Checking if other PCs in the network can connect to Steam (=> Working like a charm) PLEASE READ THROUGH THE ENTIRE THREAD, IF YOU HAPPEN TO ENCOUNTER A SIMILAR PROBLEM, I'M SURE SOME METHOD MENTIONED WILL WORK ON YOU :) EDIT after the issue has been solved, now:

Sysinternals process monitor fast io disallowed