I am trying to fix a computer for a friend, and IE keeps showing "Page cannot be displayed" when users are logged in normally. However, it is possible to ping my router and the internet from this PC when logged in. The really frustrating thing is that it will access the internet from safe mode, and works fine. Using IP addresses instead does not work, either.
I have tried all the usual suggestions (AdAware, Spybot, Ewido, HiJackThis, CWShredder, AboutBuster, msconfig), and things have been found and (apparently) deleted, but the problem still persists.
XP Home, SP2, ISP BTInternet/Yahoo! (yuk!), remnants of the ISP's Norton Firewall and AV software which I can't uninstall - this may be the problem.
However, the following things have been found:
HiJackThis implied a CoolWare infection, which has been removed using CWShredder (cws.msconfig)
Ewido Anti-Malware found ShudderLTD, and claimed to have removed it (after IE still failed, I ran Ewido again, and it found ShudderLTD again)
hosts file has been checked and has just the localhost setting.
It seems as though I am finding problems, but not removing them completely. Either the malware keeps coming back, or the Norton software keeps getting in the way, or both (or of course, neither!)
Any suggestions would be much appreciated.