I just need some simple tips.

I'm going to uninstall v. 1.5.17 and try to (re)install SD152.exe which I downloaded yesterday. I had installed SD152.exe in march (or somewhere around that time). And it turned out to be 1.5.17.

The FAQ tells me that I can uninstall it, but doing so I get a message to do a recovery and undo the immunization. These files are supposed to be in the Documents and Settings. I have copied the folder to another drive. So can I just safely uninstall Spybot without loss of the fixed errors and immunization? Because I tried to undo the immunization, but it got stuck.

Is SD152.exe really giving me the latest version (1.5.2)?

I have 1 machine with Windows XP Home SP3 and an oldy with Win98SE.
Can the latest Spybot-version (1.5.2) run on Win98SE too ('cause I had major problems here and re-installed 1.4)?

Please don't give me threads to refer to, because I've been reading so many posts about the problems that I have too (trojans.sbi, LONG scan-times, zlob.downloader.bs trouble) that I'm only getting lost. All I really want is to solve my problems.
English is not my native language, so please keep it simple.