お返事ありがとうございます。

おっしゃっているc:\tempに作成するという意味がよくわからなかったので
Winshellにコピーアンドペーストしていつものようにドキュメントに保存してみました。
PDFviewボタンで見てみると分数2分の1が表示されていました。

ドキュメントにできたre6688.logは以下の通りです。

This is pTeXk, Version 3.141592-p3.1.10 (sjis) (Web2C 7.5.5) (format=platex 2006.11.14)  13 NOV 2007 05:20
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No file re6688.aux.
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(c:/usr/local/share/texmf/tex/latex/amsfonts/umsb.fd
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] (./re6688.aux) ) 
Here is how much of TeX's memory you used:
 2438 strings out of 94481
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Output written on re6688.dvi (1 page, 288 bytes).

▼関連発言
│
└◆6674:インストールできません [池田　裕] 11/09 19:29
　└◆6676:Re:インストールできません [tDB] 11/09 19:43
　　└◆6677:Re[2]:インストールできません [池田　裕] 11/09 20:37
　　　└◆6678:Re[3]:インストールできません [tDB] 11/09 20:46
　　　　└◆6679:Re[4]:インストールできません [池田　裕] 11/09 21:33
　　　　　└◆6680:Re[5]:インストールできません [tDB] 11/09 21:44
　　　　　　└◆6681:Re[6]:インストールできません [池田　裕] 11/09 22:25
　　　　　　　└◆6682:Re[7]:インストールできません [tDB] 11/09 22:30
　　　　　　　　└◆6683:Re[8]:インストールできません [池田　裕] 11/09 23:06
　　　　　　　　　└◆6684:--- [---] 11/10 07:13
　　　　　　　　　　└◆6688:Re:--- [池田　裕] 11/12 20:26
　　　　　　　　　　　└◆6690:Re[2]:--- [tDB] 11/12 20:40
　　　　　　　　　　　　└◆6695:Re[3]:--- [池田　裕] 11/13 05:29
　　　　　　　　　　　　　└◆6696:--- [---] 11/13 08:02
　　　　　　　　　　　　　　└◆6697:Re:--- [池田　裕] 11/16 04:40<-last