Windows 7 doesn't see network card after sleep

You can in a way, but you will need to download a lot of XP drivers from Dell to run XP on a Windows7 computer.
You can not just swipe out Windows7 for XP.
For better answers about this go to http://www.dslreports.com/forum/microsoft they will walk you through this.

check that the lan connection isn't disabled.
go into control panel>network connections.
I would disable it and then re-enable it, that sometimes works. if there is no lan connection showing then you need to download it onto a usb stick from the dell website and install it on the vostro. Product Support Dell US

There does not seem to be a valid Windows 7 network driver:
http://ftp.dell.com/Pages/Drivers/dimension-3100.html#Network

You can try the driver for XP to see if that will work, otherwise you may need to buy a new NIC card.

2007 PC
the last person (anon) on earth using XP?
XP ended support 2014
XP is virus magnet from H3LL.
XP has no futures or support
XP devices, 2014 and newer added will fail zero support.
why run XP all you will do is infect the rest of the earth.
end XP now, format C:.
end it. use Unbuntu on old PC, not XP ever.
no more intel support for

Intel 965 Express Chipset Family
same goes for Ricoh R5C833
same goes Sigmatel STAC9205 High Definition Audio
codec

last dell support was vista 2009

https://www.dell.com/support/home/en-us/product-support/product/vostro-1500/drivers


old laptops beg for linux, never windows.

Not much to go on with your question. Windows 7 does not see your network adapter(s). Did you just upgrade? If so, you might need to go back to Dell website and download the Win7 drivers for you laptop. On that laptop you should see 3 network interfaces for WiFi, Ethernet, and the modem, and possibly a 4th for bluetooth. Dell is pretty good with downloads - just type in your service code at their support site, and they will only show you what you might need for your computer.

Hi
Win 7 is extremely touchy about network drivers. I didn't see your computer model listed but you'll need to log onto your computer manufacturers support page and download the Win 7 drivers for the network. Since your internet connection doesn't work right now I'd suggest another machine, if you have one or go to your local library with a Flash Drive and download the drivers to that. Good Luck

just format the drive and install the os windows 7 again.. connect it to the internet while installing it.. once done with the installaion.. click on the volume icon on side tray.. it will search for the solution online and will automatically install the drivers.. i have the same model desktop and i am using win 7 with all working... good luck!!!

You must buy a pci spec'ed Ethernet care. This will fit into the white socket on the system worse case you go buy a USB based ethernet adapter.

If you're using your system as the Host for the other systems, turn off your sleep mode. The Host should be active at ALL times.

I have the same network card.
Never had this problem with Vista (32 bit) but recently switched to Win7 (64 bit) and had the same problem as you.
I solved by going under Control Panel->hardware->network card properties->power save and unchecking "Allow pc to switch off the device to save power"