XP system restore feature is no more available
no check disc possible on the C: drive
links from Google search results are erroneus
all access to any antivirus web sites are blocked
Microsoft support web access are blocked

Do anyone have a solution?

Hi,

Can you please go to C:\WINDOWS\system32\drivers\etc and search for the file called Hosts. Open it using Notepad and copy/paste the content of the file. The file should be something like:

# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost

You should have a single file without argument such as above the 127.0.0.1 line.