Add/Remove Programs problem

Got value creation failed " at line 521 when trying to open the Control Panel applet Add/Remove Programs in XP. Turns out something to do with themes causes this. When I switch to the vanilla XP theme Add/Remove programs works, when I switch to, for instance, the Milk theme it doesn't work. To make things even stranger, this problem is only present on my home computer not at work, even though the same theme files are installed on both computers...

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