I have a similar issue with Windows 7. Initial install connects to ADSL modem (wired), however once (various) programs are installed the connection is lost (on reboot). Not all programs cause this issue (AV, Office etc. don't), have a feeling that it's down to Adobe install (haven't had time to prove it yet). Unfortunately system restore doesn't cure the issue - only a fresh install of the OS does?
Anyone out there have similar problems/know the solution?