The clock reset is an indication your main and/or CMOS battery is shot, in addition to time it also stores network and display settings.
An old main battery can drain completely when there's no power connected, and then the backup battery must immediately take over the preservation of PRAM contents, but it can only hold them for a relatively short time. If AC power isn't reconnected before the backup battery too has been drained, all the contents of PRAM are lost. This is why it's a good idea to leave the power connected to a machine as old as yours.
The space might be the CD you're trying to write too (most are <800MB) OR free space on your HD (should be 20% of total HD, so if you have a 20GB HD you should never have less than 2GB free).
Check your network setting manually to ensure that wireless is enabled, or that your Ethernet card settings were not removed. (Use System Profiler to ensure that you network cards are not broken-if they don't show up in the list they are).
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