there is your problem right there you need to delete some stuff. I dont run any after market themes anymore they wind up costing precious memory.
go to options status and check memory then delete those themes and see what it is then. There is no need to keep multiple themes installed you can only run one at a time.
This is mine with:
Themes: Preinstalled only
Games: 0
Misc apps:
facebook
berry a code
google sync
ascendo money
bbsmartview
bb weather
2 gigs worth of music.