Can I upgrade Windows 7 Starter on EEE PC1015b?

HI all,
I have an EEE pc 1015b 5 months old and have already upgraded the RAM to 2 gigs because it ran soooo slowly when I got it. It came with wondows 7 starter - can I upgrade to the proper windows 7 (would like the media player options) without losing even more performance. It's still pretty slow and freezes if it has to do too much - like use our 32" tv as a monitor to show pictures or videos.
Any advice about the upgrade - or about why it freezes and what I can do about that would be great.
 
Thanks - what a speedy reply - will look into it - I am worried about the netbook running even slower... do you think it will?
Can I reverse the upgrade if it does?
 
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