Hi there, sorry about late reply but I've been busy elsewhere.
I imagine you can make changes with msconfig, ccleaner Startup manager, or in Services.
Black Viper suggests to use Services instead of msconfig. (I will direct you to the XP Pro page)
http://www.blackviper.com/WinXP/servicecfg.htmI find msconfig to be quicker and final in terms of changes that are made. But that is only my preference.
Sometimes I check the changes in Services to see how I'm doing, which is really why I mentioned Services.
The direct to LSPfix is to see if any changes needed to be made - that is a general directive for those entries.
Also there are some questions concerning the usage of SpybotSD and/or Teatimer, and whether or how they run in conjunct with avast.
For myself I have no experience with these products so there is little more that I can add.
Has the recent update in avast virus definitions meant a return to normal running in avast 5?