Cannot Activate Plugins

Hi,

I truly don't know what plugin might be causing this but whenever I try to activate newly WPMU installed plugins, I get the following on the browser:

WordPress can automatically look for some common database problems and repair them. Repairing can take a while, so please be patient.ide

I had installed the multi-db plugin but although I did not activate it and consquently deleted, I still get the above message. Any ideas?

When I checked the database from the server side, I got the following messages about primary keys in some tables:

Problems with indexes of table wps_2_affiliatedata
UNIQUE and INDEX keys should not both be set for column user_id
Problems with indexes of table wps_2_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_3_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_4_affiliatedata
UNIQUE and INDEX keys should not both be set for column user_id
Problems with indexes of table wps_4_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_4_hmp_playlist
PRIMARY and INDEX keys should not both be set for column id
Problems with indexes of table wps_5_affiliatedata
UNIQUE and INDEX keys should not both be set for column user_id
Problems with indexes of table wps_5_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_6_affiliatedata
UNIQUE and INDEX keys should not both be set for column user_id
Problems with indexes of table wps_6_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_affiliatedata
UNIQUE and INDEX keys should not both be set for column user_id
Problems with indexes of table wps_eab_bookings
UNIQUE and INDEX keys should not both be set for column event_id
Problems with indexes of table wps_pro_sites
PRIMARY and INDEX keys should not both be set for column blog_ID
More than one INDEX key was created for column blog_ID

I don't know if it is safe to delete the extra Primary and Index keys. Could they be causing Wordpress to launch the above message?

Thanks so much for your help.

Barb