Hacked email. PW reset. Constant requests for passwords come up in several apps.

MacBook 2.16 GHz Intel Core 2 Duo. 3 GB 667 MHz DDR2 SDRAM. OS 10.7.5.

After XXXXXXX@bellsouth email was hacked I got pw reset and email receipt/send is fixed (except for these pw request popups).

Constant requests for passwords come up during use of different pieces of sw, incl all those listed below:

"syncdefaultsd wants to use the xxxxxxxxx keychain"

and

"SafariDAVclient wants to use the xxxxxxxxx keychain"

and

"ICAL wants to use the xxxxxxxxx keychain"

and

"AddressBookSourceSink wants to use the xxxxxxxxx keychain"

and

"Messaging Agent wants to use the xxxxxxxxx keychain"

and

"ICAL can't login to your XXXXXXX account because your password may be incorrect",

where xxxxxxxxx is consistent.

I thought I had fixed this in Keychain but evidently I have not. Putting the passwords in does not 'keep' them in place.

Any help with how to basically 'start over' with keychain and eliminate this annoying, constant problem?

Thank you ahead of time.