EDIT: Your system is assigned a certain space called shadow copy storage, when this is used up, older restore points are overwritten. They are not retrievable. You can though, increase the shadow copy storage through the Command Prompt to save restore points futher back than 30 days, but this will not help you now.
How to manually uninstall earthlink Accelerator using regedit:
Registry Editor - Find and Find Next
Start> in search, type, regedit
>click enter, click "continue"> click "edit" , in search type, earthlink
(or if you do not wish to remove all Earthlink entries type earthlink accelerator
)>click "find"/"find next">delete all entries/folders highlighted untill no more exist.
!!!Caution!!! back up registry/ or create restore point before attempting to edit