To delete all the restore points on your computer,...disable and re-enable system restore on the system.
Click Start...Control Panel... and then the System icon.... Click on the System Restore tab in the dialog box...put a check in the Turn off System Restore check box... and click Apply. Clear the check box again to re-enable System Restore and then click OK.
if you use the 2nd option ...create a RP manually so you have at least one good one...
just launch firefox first....then when you follow a link, such as to this site...firefox will handle it instead of IE