i have windows xp pro on old toshiba. When first had it was very fast. All I do is use internet and email and facebook. No games. I have very little knowledge but have defraged, run a cleaner regularly, made as much memory space as poss by deleting some photos and messages I wanted to keep. But laptop still getting slower daily. I got a virus at one point and phoned microsoft who took over and deleted loads of stuff but still no help. I run avg security. Also think I accidentally deleted the wireless certificate as when I try to connect I get a message saying a certificate cant be found. Can I restore that? I have tried to restore settings to earlier time and wont work tho has in the past. Keeps saying out of virtual memory. Any help appreciated. Cant afford another laptop or to pay anyone to sort it out.

HiIt seems that your computer is suffering from multiple troubles, which is almost impossible to solve through forums' posts.I do not know what the certificate issue is. Regular Wireless connection to you own Router does not need any certificate.This page might help in further cleaning (courtesy of Moderator Malkeleah) can provide further help.http://www.elephantboycomputers.com/page2.html#Removing_MalwareWhen the computer is clean, do this.WinSock and TCP/IP Refresh. Type Cmd in the Start Search text box.Press Ctrl-Shift-Enter keyboard shortcut to run a Command Prompt as an Administrator. Allow elevation.Type netsh winsock reset in the Command Prompt , and then press the Enter key.Do the same processes for refreshing the TCP/IP just replace the typed command with.netsh int reset press Enteripconfig /flushdns press EnterRestart your Computer.---------------------------------If your Wireless does not work this process might help.Go over these steps and tell us where the breaking point is.Check the Device Manager for valid Wireless card entry.http://www.ezlan.net/Win7/net_dm.jpgIf there is No valid entry, delete any Bogus Entry, and re-install the Wireless card's Drivers.Check the Network connections to make sure that you have a Wireless Network Connection Icon/Entry, and that the Properties of the Icon (right click on the Icon) are correctly configured with TCP/IPv4 protocol in the Network Connections Properties.http://www.ezlan.net/Win7/net_connection_tcp.jpgMake sure that if there is a vendor's Wireless Utility the utility is Not Running together with the Windows native Wireless utility.----------------Make sure that No Firewall is preventing/blocking the Wireless components to get to the Network.Some 3rd party Software Firewalls keep blocking aspects of Local Traffic even it they are turned Off (disabled).If possible configure the Firewall correctly, otherwise totally uninstall it, and get rid of its residual processes to allow clean flow of local network traffic.If the 3rd party software is uninstalled or disables, make sure that Windows native Firewall is On .---------------------------Working TCP/IP stack should look this way.Right click on the Wire card Network Connection, choose Status, Details, and see if it got an IP and the rest of the settings.http://www.ezlan.net/Win7/status-nic.jpgDescription is the card manufacturing data.Physical address is the card's MAC number.The xx should be a number from 0 to 255 (all xx same number).yy should be from 0 to 255zz should be from 0 to 255 (all zz the same number.The lease date should be valid to the current time.*Note 1. IP that starts with 169.xxx.xxx.xxx is not valid functional IP.*Note 2. There might be an IPv6 entries too. However, they are not functional for Internet traffic or LAN. They are needed for Win 7 special HomeGroup configuration.---------------------------------------------------A message in the Wireless little Window that says Connected does not means that your are really have a valid functional connection.If everything above is OK you have to be able to connect to the Router.Connecting to the Router means that you can enter the Router's core IP into an address bar of a browse, be able to connect, see, and configure the Router's menus.If it does not connecting to the Router, log from any computer that can connect to Wireless Router with a Wire, disable the Wireless Security, make sure that the Wireless broadcast SSID is On, and try to connect with No Wireless security.Enable the Wireless security after you mange to establish a functional connection.----------------Have a happy Thanksgiving.Jack-MVP Windows Networking. WWW.EZLAN.NET

First let me say you are using XP Pro and you are in the Vista forum. You are also using Windows to manage your Wireless. Windows is asking for a certificate which does not exist. Do this: Control Panel, Network Connections, Right click Wireless Network Connection, Choose Properties, Choose Wireless Networks Tab, Double Click your connection in the box, or click one time to highlight and choose Properties, Now choose Authentication Tab, Uncheck the box Enable IEEE 802.1x authentication for this network. When this box is checked Windows is set to ask for a certificate. Windows will no longer ask for one now. You should now be able to connect. If not post back and I will tell you what else to do. Also post back and tell the forun if it did work. Good Luck