Im running 32bit vista home premium on an acer 5920 laptop and have recently lost my ability to connect both through ethernet and built-in wireless adapter. The computer in using right now is a custom build desktop running xp pro; this computer has a direct usb connection to my siemens 6520 speedstream modem. I have tried hooking the laptop up to the modem with an ethernet cable(which should have worked without configuration). Symptoms:

1)network diagnostics give me the message "There might be a problem with one or more network adapters on this computer"

2)If i do get a connection wirelessly on startup, its usually 'connected with limited access'

3)enet management keeps encountering problems and closing

4) system restore is always unsuccessful

5)ive recently used advanced system optimiser to clear my system up. could that be the culprit?

6)network adapters listed in device manager:
broadcom netlink gigabit ethernet
intel(r) pro/wireless 3945abg network connection

im pretty much a n00b at this so ill know the general, basic stuff =P

please help =[

-R A.

Yes, I would say your clean probably damaged the tcp/ip stack or a network component. Disable both on-board NICs in BIOS. Remove them from Vista. Shutdown and restart. Make sure they are gone in device manager. Remove their entries in network setup. Shutdown and enable them one at a time and restart to reinstall them. Don't do both at same time.

im only 13, so, im sorry if im going to sound a little low, but:

1) BIOS is the menu you see when you press F10 during startup right?

2)i shut down after i remove one from vista and then remove the second and restart again, am i right?

i wasnt able to find the NICs in bios.
i uninstalled the two in device manager instead, leaving the drivers, and restarted.
on startup, they reinstalled and the whole network list was refreshed. i then attepted to connect to the modem wirelessly after confirming the security passkey i entered.
i was given limited access once again and could not use the internet

under the non-plug and play devices list that appeared in device manager after i followed the steps on the webpage, i noticed there were a few items with yellow warning signs on their icons.
these being: HTTP, TCP IP Protocol Driver, Symantec Intrusion Prevention Driver

i suspect, as SCSIraidGURU said, that my tcp/ip stack and/or a network component is indeed damaged or missing. i.e: the two items i have highlighted in blue

when i went to the TCP IP Protocol Driver's properties list its status states 'the device is not present, is not working properly, or does not have all its drivers installed (Code 24)'
in its driver tab there is an option to start the driver. when i press start i get a message saying 'element not found' which tells me it is missing

it is all the same when i went to theHTTP's properties, except when i pressed start i got the message 'the network location cannot be reached'

however, under my network adapters list there are many more devices listed. all of them are enabled and seem to be doing fine

i cant find the nics in the bios =P
i have no idea where theyre located withing the bios

ill try that then

On-board components should be in the BIOS. You might have to hunt for them. You want to remove the drivers and device manager settings completely. Then, disable them in the BIOS to make sure Vista uninstalls everything associated with it. Then enabling them will allow Vista to create new entries and hopefully fix the components.