Vista Tutorial - Host Process for Windows Services has stopped working

Every once in a while, I get a message that says the host process for windows services has stopped working. It doesn't occur everytime I start up my computer and it just started appearing a couple days ago. The problem details are listed below:

Problem signature:
Problem Event Name: BEX
Application Name: svchost.exe
Application Version: 6.0.6001.18000
Application Timestamp: 47918b89
Fault Module Name: rasmans.dll_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4791a756
Exception Offset: 63ff60b3
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 1033
Additional Information 1: b2be
Additional Information 2: 82109204b3973566ace818217390e302
Additional Information 3: efc3
Additional Information 4: bdb39985db888da86c189f9d4c112241

I recently had a problem with McAfee Antivirus that I didnt know how to fix. Someone recommended that I uninstall McAfee and install Avast instead as an antivirus software, so I did just that. Is it possible that this problem is related to installing Avast? Any help would be appreciated.