Please help! Trying to set up USB mining with BitMinter

[Benefactor]

I was trying to set up a BitMinter account on my computer, but I got the following message:

"Unable to launch the application !"

And when I clicked on the 'Details' button, I got the following under the Exception tab:

-

Cache must be enabled for nativelib or installer-desc support,http://bitminter.com/client/1.4.0/lwjgl-x86-win.jar

-

Under the Launch File tab it said:

-

<?xml version="1.0" encoding="utf-8"?>
<!-- BitMinter Client JNLP file -->
<jnlp spec="6.0+" codebase="http://bitminter.com/client/1.4.0/"
      href="bitminter.jnlp">
  <information>
    <title>BitMinter Client</title>
    <vendor>BitMinter.com</vendor>
    <homepage href="http://bitminter.com/"/>
    <description>BitMinter</description>
    <description kind="short">Mining for the digital mint</description>
    <icon href="bitminter256x256.png" width="256" height="256"/>
    <icon href="bitminter64x64.png"   width="64"  height="64"/>
    <icon href="bitminter48x48.png"   width="48"  height="48"/>
    <icon href="bitminter32x32.png"   width="32"  height="32"/>
    <icon href="bitminter16x16.png"   width="16"  height="16"/>
    <icon kind="splash" href="bitmintersplash.png"/>
    <shortcut online="true">
      <desktop/>
      <menu submenu="BitMinter"/>
    </shortcut>
  </information>
  <security>
    <all-permissions/>
  </security>
  <update check="always" policy="always"/>
  <application-desc main-class="com.bitminter.client.Main"/>
  <resources>
    <java version="1.6+" initial-heap-size="40m" max-heap-size="800m"
     java-vm-args=""/>
    <jar href="bitminter.jar"/>
    <jar href="scala-library.jar"/>
    <jar href="scala-swing.jar"/>
    <jar href="scala-actors.jar"/>
    <jar href="SteelSeries-3.9.30.jar"/>
    <jar href="trident-6.3.jar"/>
    <jar href="audio.jar" download="lazy"/>
    <jar href="quartz-2.1.1.jar"/>
    <jar href="images.jar"/>
    <jar href="slf4j-api-1.7.5.jar"/>
    <jar href="lwjgl-2.8.4.jar"/>
    <jar href="lwjgl_util-2.8.4.jar"/>
    <jar href="coincore-1.9.0.jar"/>
    <jar href="gridnode-1.2.1.jar"/>
    <jar href="purejavacomm-0.0.17.jar"/>
    <jar href="jna-3.5.1.jar"/>
    <jar href="jna-3.5.1-platform.jar"/>
    <jar href="httpclient-4.2.5.jar"/>
    <jar href="httpcore-4.2.4.jar"/>
    <jar href="httpcore-nio-4.2.4.jar"/>
    <jar href="lift-json_2.10-2.5.jar"/>
    <jar href="paranamer-2.5.2.jar"/>
  </resources>

  <!-- LWJGL Linux 64-bit native libraries -->
  <resources os="Linux" arch="amd64">
    <nativelib href="lwjgl-amd64-linux.jar"/>
  </resources>
  <resources os="Linux" arch="x86_64">
    <nativelib href="lwjgl-amd64-linux.jar"/>
  </resources>

  <!-- LWJGL Linux 32-bit native libraries -->
  <resources os="Linux" arch="x86">
    <nativelib href="lwjgl-x86-linux.jar"/>
  </resources>
  <resources os="Linux" arch="i386">
    <nativelib href="lwjgl-x86-linux.jar"/>
  </resources>

  <!-- LWJGL Windows 64-bit native libraries -->
  <resources os="Windows" arch="amd64">
    <nativelib href="lwjgl-amd64-win.jar"/>
  </resources>
  <resources os="Windows" arch="x86_64">
    <nativelib href="lwjgl-amd64-win.jar"/>
  </resources>

  <!-- LWJGL Windows 32-bit native libraries -->
  <resources os="Windows" arch="x86">
    <nativelib href="lwjgl-x86-win.jar"/>
  </resources>
  <resources os="Windows" arch="i386">
    <nativelib href="lwjgl-x86-win.jar"/>
  </resources>

  <!-- LWJGL MAC OS/X native libraries -->
  <resources os="Mac">
    <nativelib href="lwjgl-macosx.jar"/>
  </resources>

</jnlp>

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[Benefactor]

If you are reading this, and can't help, could you post a link to this thread in the 'technical' thread?  As a newbie, I can only post here, and maybe the experts who can help won't be reading this?

Thank you.

[DrHaribo]

Did you disable the Java cache?

http://247support.custhelp.com/app/answers/detail/a_id/10166/%7E/enable-java-to-cache-files

[Benefactor]

Thank you for that.  It still didn't work, because even in the 'classic view', I don't have Java showing up.  I definitely have Java 7 on my computer, and uninstalled and reinstalled it, already, but it's screwed up.  At one point, months ago, I was fed up with Java and started changing things.

I really don't want to be mining off of the proposed computer, anyway, (sour grapes), so how about this question:

If I just needed a new computer to run 30 USB minters off hubs from, what could I get that would definitely work out of the box, but would be real cheap?  (Really, I'm hoping for a budget under $200, if I can get that to work, hopefully for something 'new'.)

What/where should I buy a new cheap computer for just mining?