Sorry to hear about the problem that you're having with Paypal in PrestaShop 1.5. Upon investigating this issue, it appears that it may be related to an update with the PayPal module. Checkout this post from the PrestaShop Support forums. The poster was also using an older version of PrestaShop (1.5) and he was able to get the module working.
I hope this helps to answer your question, please let us know if you require any further assistance.
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