from PosgreSQL 7.1b3 to 7.0.3

I have PosgreSQL 7.1b3 running on one of our test  servers. It  seems like
PosgreSQL 7.1b3 is not very stable. I want to go back to 7.0.3v since it  it
the most stable version available. I am just wondering   what should I do. can
I reinstall 7.0.3 on 7.1b3 directly ? If not then what steps should I take. I
can always use pg_dump to dump data and stuff..
By the way 7.1b3 is crashing   3 to 4  times a week. We have 7.0.3 running on
another server and it rarely crashes.
Thanks in advance. Regards.