Wireless Network, Is it the router or my computer? Options

[JimiJimi]

OK, so I'm having problems with my wireless networking. It was working fine until my friend brought his computer over for some LAN games and fiddled with my network settings. Once he'd gone I fiddled around with the settings some more so I could actually get onto the network in short bursts before it disconnected itself. I'm getting a decent signal and it usually connects when I tell it to after it disconnects. Sometimes though it doesn't reconnect and it's usually because it has changed the network settings from:

Network Authentication: Shared
Data Encryption: WEP
Network Key: [My network key in here]
Confirm Network key: [My network key in here aswell]
Key Index: 1
The key is provided for me automatically: Unchecked

To:

Network Authentication: Open
Data Encryption: WEP
Network Key: [My network key not in here]
Confirm Network key: [My network key not in here either]
Key Index: [Unchangable]
The key is provided for me automatically: Checked

Stuff in bold is the stuff that changes.

OK, so once I've re-entered all the correct settings and waited a minute to get back on the network, I'm on the network for about another three minutes before it disconnects again. Which lets me on the network at least, but it's still a bit of a chore having to fill in all those details before going on the network every three minutes. All I wanted is a way to stop it from changing the settings, or if the settings above are incorrect, what the settings should be.

Another annoying point is about every tenth time I get disconnected I have to restart the router before I can reconnect.

Additional network information:

No. of computers on network: 2
Router: NETGEAR DG834G Integrated ADSL Modem 54Mbps 802.11g Wireless Firewall Router
Wireless PCI cards (in both PCs): Belkin 802.11g Wireless Desktop Network Card

I'll also say that it's disconnected at least six times whilst trying to write this post

[DarkInferno]

smack a cable into that badboy do a hard reboot and set it back up from scratch.

oh and password protect your setting so 'mates' can't f-mess your equipment up.