I can't really think of anything else you could do other than root it and put a new ROM on. It's not as hard as you might think, it just takes a bit of reading first to understand the terminology.
If you're at all interested, take a look at this thread - Orange San Francisco (ZTE Blade): All Things Root Guide
which has info on root terminology and and guides on how to do it. If you have any more questions about it fire away