Now What?

I resolved the Lsass.exe crisis and my files are pretty much intact, I just want to know what would be a good registry cleaner in case that happens again. Also, I want to know if I need to put in another partition like the Ubuntu or anyhting so that I can access my files just in case it happens? Should I really get a new partition or am I fine with just one?

Again,

HP Vectra

80 GB

256 MB of RAM