When I try to run Windows Update it comes up with an error page. I can’t log onto my Internet banking either.
The fact you can’t open secure sites sounds like Internet Explorer has hit a problem. If it were just Windows Update, then it would be a different fix. Secure website issues are usually due to the Windows XP cryptographic service.
Click Start, and then click Run.
In the Open box, type cmd, and then click OK.
At the command prompt, type the following commands, and press ENTER after each command, you might be asked to click OK after each command
regsvr32 /u softpub.dll
regsvr32 /u wintrust.dll
regsvr32 /u initpki.dll
regsvr32 /u dssenh.dll
regsvr32 /u rsaenh.dll
regsvr32 /u gpkcsp.dll
regsvr32 /u sccbase.dll
regsvr32 /u slbcsp.dll
regsvr32 /u mssip32.dll
regsvr32 /u cryptdlg.dll
exit
Restart your computer.
Click Start, click Run, type cmd in the Open box, and then click OK.
At the command prompt, type the following commands, and press ENTER after each command:
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 dssenh.dll
regsvr32 rsaenh.dll
regsvr32 gpkcsp.dll
regsvr32 sccbase.dll
regsvr32 slbcsp.dll
regsvr32 mssip32.dll
regsvr32 cryptdlg.dll
net stop cryptsvc
ren %systemroot%\System32\Catroot2 oldcatroot2
net start cryptsvc
exit
Now click on start and reboot your computer.