I have Windows XP as a virtual machine in Parallels Desktop 5 on my MacBook running OSX 10.6.4. Let me start by saying I don't believe this problem is Mac related and seemingly not Parallels related.

After receiving the System Tool 2011 trojan, I took the steps on http://www.helpmyos.com/t2311-how-to-remove-system-tool-2011

The infection seems to be gone but I cannot access the network connect now although Avira CAN access the internet and downloads the latest virus definition. (Hope I remember it all)...I've tried,

1) Using typical Windows Diagnostic tool that appears with IE. It cannot resolve the internet disconnect. Also, (I use Verizon Fios) Verizon's In-Home Agent pops up and tries to solve it to no avail.

2) I used the advise of reseting the network connection in Parallels to default settings. Didn't work.

3) Tried to "Repair" Local Area Connection 3 (right click...) because that is how I believe Parallels connects with the Mac internet connection. It seems to think there is no problem because "Windows finished repairing your connection."

4) Investigated Windows Firewall a bit and tried enabling a number of services under the advanced tab - no luck.

5) Uninstalled Malwarebytes (after use) in case that blocked something.

I did run MSS in case any of those logs helps solve this problem. I know this is an advanced problem, though I believe it is strictly Windows XP related, I appreciate any help you can give. My mac is running normally with mail and internet working.

Thanks! GKo

# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost

127.0.0.1 .psf

Antivirus: AntiVir Desktop *Scanner enabled* (Up to date) {AD166499-45F9-482A-A743-FDD3350758C7}

System File Integrity

6D4FEB43EE538FC5428CC7F0565AA656 C:\WINDOWS\system32\eventlog.dll
A86BB5E61BF3E39B62AB4C7E7085A084 C:\WINDOWS\system32\scecli.dll
1B7F071C51B77C272875C3A23E1E4550 C:\WINDOWS\system32\netlogon.dll
9F3A2F5AA6875C72BF062C712CFA2674 C:\WINDOWS\system32\drivers\atapi.sys
08FD04AA961BDC77FB983F328334E3D7 C:\WINDOWS\system32\drivers\agp440.sys
044452051F3E02E7963599FC8F4F3E25 C:\WINDOWS\system32\drivers\disk.sys
1DF7F42665C94B825322FAE71721130D C:\WINDOWS\system32\drivers\ndis.sys
A32426D9B14A089EAA1D922E0C5801A9 C:\WINDOWS\system32\drivers\usbstor.sys
DA1F27D85E0D1525F6621372E7B685E9 C:\WINDOWS\system32\drivers\beep.sys
12896823FB95BFB3DC9B46BCAEDC9923 C:\WINDOWS\explorer.exe
8C515081584A38AA007909CD02020B3D C:\WINDOWS\system32\alg.exe
8AAD333C876590293F72B315E162BCC7 C:\WINDOWS\system32\ansi.sys
BDAAF79DD63F194434D31A74B9BB8B77 C:\WINDOWS\system32\crypt32.dll
2EF237A6B7232F45A7DF000C54974BF1 C:\WINDOWS\system32\ieframe.dll
9EF487A186DEA361AA06913A75B3FA99 C:\WINDOWS\system32\drivers\kbdhid.sys
B921FB870C9AC0D509B2CCABBBBE95F3 C:\WINDOWS\system32\kernel32.dll
ED4BF709AAD8B665075DE06A0945B030 C:\WINDOWS\system32\keyboard.drv
FBBCFEC1379C5C02D88A361993EDF1B8 C:\WINDOWS\system32\keyboard.sys
7D29780AC88BB7292CDCFF71BA67433D C:\WINDOWS\system32\mouse.drv
4A0B06AA8943C1E332520F7440C0AA30 C:\WINDOWS\system32\drivers\i8042prt.sys
463C1EC80CD17420A542B7F36A36F128 C:\WINDOWS\system32\drivers\kbdclass.sys
304CFF53C9C9BEB03607ABE94A8FC781 C:\WINDOWS\system32\shell32.dll
8FD99680A539792A30E97944FDAECF17 C:\WINDOWS\system32\drivers\acpi.sys
CCF5F451BB1A5A2A522A76E670000FF0 C:\WINDOWS\system32\drivers\pciide.sys
76C465F570E90C28942D52CCB2580A10 C:\WINDOWS\system32\drivers\scsiport.sys
9AEFA14BD6B182D61E3119FA5F436D3D C:\WINDOWS\system32\drivers\tcpip.sys
832E4DD8964AB7ACC880B2837CB1ED20 C:\WINDOWS\system32\mswsock.dll
D72B9EC3337B247A666F098F3D6B43DE C:\WINDOWS\system32\winrnr.dll
72451FD61DDBB0A1FB071B7C3CDE5594 C:\WINDOWS\system32\rsvpsp.dll
{EOF}

For those who lost internet with the System Tool 2011, I used all methods on this page, but the 4th seemed to solve my internet issues.
http://www.removevirus.org/no-internet-after-virus-infection
Nobody on the Geek Force left a suggestion for me.

Hello.
Try this.

Remove the Proxy setting in Internet Explorer and/or in FireFox.

In Internet Explorer

1. Tools Menu -> Internet Options -> Connections Tab ->Lan Settings > uncheck "use a proxy server" or reconfigure the Proxy server again in case you have set it previously.
   

In Firefox

1. Tools Menu -> Options... -> Advanced Tab -> Network Tab -> "Settings" under Connection > Choose "No Proxy"
   
2. Click the apply button and restart that computer in normal mode.
   

Can you access the net now?