Can anyone tell me what the advantages of CS3 are over PSE4? I've had PSE4 for about 2 years and after quite a steep learning curve got pretty confortable with it. Due to some unidentified problems with the computer, DH bought me another which came with PS CS3 already loaded.

**FRUSTRATION**

I don't wanna learn another program (whine, whine), I liked what I already had (more whining). I can't for the life of me find the PSE4 disk, so in a fit of MORE frustration I ordered one from eBay. So...my question: PS CS3 seems so much more advanced. Is it worth learning, or should I delete it when PSE4 arrives? I only use for minor photo editing and SB'ing. Will it mess up anything if I leave both of them on the system?
TIA!
Maria