Im pretty confused as to what youre doing there. Error msgs? Slow? Also what does Win7 have to do with anything here? Scripting? Huh? Also, how did you install to an external drive without 1st booting from a cd/dvd (which contrary to what youve said is exactly how aros works, in fact it more or less has to,at least at 1st).
Sorry,Im not being condescending here, but nothing much youve said makes sense to me.
Seeing as you mention not having used it before I'll try explaining a few things so you can at least ask for help more clearly.
Firstly, aros comes in many "flavors", and works on multiple cpu architectures. Now being that youve mentioned a P4 Im going to assume you want to use x86 AROS. This alone leaves you with multiple options. There's hosted versions, which run akin to an app inside Windows, Linux and Darwin based systems. This flavor can be practical, and sometimes ueful for developers, but the best way to run AROS is natively, directly on the hardware without another OS involved (although other OSes on other partitions are fine and have no real influence on AROS). To do so you can use nightly builds (probably not recommended for people new to AROS as while they contain the latest AROS core components they can also contain the latest bugs), or one of the 3 AROS distros, ranging in order of lightest to heavyest, AspireOS, Broadway, and Icaros. The latter 2 contain a lot more software, but are also much larger. Despite being targetted at AsusAspire machines it does work on other hardware and might be a good choice for peoplw who like to build from the ground up. it does contain more software than the nightlies though, which are something akin to a bare os3.x install.