Thanx to Slees, we no longer have to worry about those so-called “Generic Host for Win32 Process” and “svchost.exe” errors that haunt our Windows XP almost daily (If not cured). Below i will explain what are the symptoms of this evil problem and how easily it can be fixed: 
Symptoms:
* You are surfing the internet or are engaged any type of Internet activity when suddenly all your Network activity goes to hault. You can still see the Internet connected icon in the tray but you cannot surf, browse or do anything.
* You get an error message something like “Generic Host Process for Win32 Services has encountered a problem and needs to close. We are sorry for the inconvenience.”
* Error message reporting about faulting netapi32.dll and svchost.exe.
* You try to disconnect your Internet because of no activity observed but the Internet icon wont disappear.
* You recieve an error message something like “Your PC has recovered from a serious problem” etc.
Solution:
Follow these simple steps and your Windows will be fully cured of this menace 
Close Port 445:
1. Start Registry Editor (Regedit.exe) by clicking Start menu, and then click the Run icon.
2. In the small box that Opens, type: regedit then click the OK button. The Registry Editor will now have opened.
3. Locate the following key in the registry:
HKEY_LOCAL_MACHINESystemCurrentControlSetServicesNetBTParameters
In the right-hand side of the window find an option called TransportBindName.
Double click that value, and then delete the default value, thus giving it a blank value.
Close Port 135:
1. Then you must now navigate to the following registry key:
HKEY_LOCAL_MACHINESoftwareMicrosoftOLE
2. You will see there is a String Value called: EnableDCOM
Set the value to: N (it should currently be Y)
3. Close the Registry Editor. Shutdown and Restart your computer.
Well thats all but if you want you can disable NETbios.
Update: For whole those who are looking for an alternate solution to fix this error please consider my latest post to Fix Generic Host Error
Fix Generic Host For Win32 Process Error
My last post about Fixing Generic Host Error on your Windows was appreciated a lot not only in the blogosphere rather the whole Internet. I do not say this out of mere words rather if you search Google for “Fix Generic Host” you will find my blog at the top and most of my traffic from Google is due to this.
This error has been haunting most of Windows PCs from a long time and is really one dreadful bug. The problem in my last fix was that it would cure the Generic Host Error Message from appearing but it would close the connection to the network PCs.
Here are 4 new solutions to the Generic Host For Win32 Error in Windows:
Solution# 1:
1. Hop to ‘Run’ and open ‘Regedit’
2. Navigate to:
HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Browser > Parameters
3. Find the Key
Name: IsDomainMaster
and set
Data: False
4. Restart Your PC
Solution# 2:
1. Go to ‘Run’ and open ‘cmd’
2. Type ‘netsh’ in command console then press enter
3. Then type ‘winsock’ and press enter and then type reset
4. Restart Your PC
Solution# 3:
Get the LspFix and follow the steps as directed
Solution# 4:
Get the Microsoft Update Patch and apply it. Thanx to Nirmal for this.
I hope one of these solutions will definitely help you rectify the erorr
Moreover you can always see my old guaranteed post about Fixing Generic Host Error
