windows 7 clock jumps back about every hour + internet disconnects

Solution 1:

Possible causes are:

• misconfigured ntp-settings
• wrong time-zone
• misconfigured time on virtualization-host (e.g.: machine running as vm on VMware ESX)

You could also check your system-log (keystroke: WINDOWS + R, type eventvwr, open Windows-Logs -> System). Normally the change of system-time should be logged there. Do you have log-entries about changing or updating the system-time?

Update 2011\11\19 21:56:
Maybe the problem is any third-party-software or another misconfigured service. Have you already checked your system for malware? You could clean up your installed software, run clean-up-tools like CCleaner and check your autostart (run: msconfig, then disable any not-needed service and application on service- and startup-register).