Query with too many variables

Try this:

SELECT * 
FROM History, Temp
WHERE History.Ticker = Temp.Ticker AND History.Quarter = Forms!Front!PreviousQuarter AND History.Category <> Temp.Category

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One way is to select records using INNER JOIN, then apply the where clause.

UPDATE HISTORY INNER JOIN Temp ON History.Ticker = Temp.Ticker
SET HISTORY.fld1 = Temp.fld1, HISTORY.fld2 = Temp.fld2
WHERE History.Quarter = Form!Front!PreviousQuarter AND History.Category <> Temp.Category

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Can you provide some sample data for the two tables and what you expect the result of the update to look like?

Here is what I have and the query doesn't return anything -

SELECT [Temporary Add to History per Quarter2].*, *
FROM [Temporary Add to History per Quarter2], [Fund History]
WHERE ((([Fund History].Quarter)=[Forms]![Front]![Previous Qtr]) AND (([Fund
History].[Full Name Category])<>[Temporary Add to History per Quarter2]![Full Name
Category]) AND (([Temporary Add to History per Quarter2].Ticker)=[Temporary Add to
History per Quarter2]![Ticker]));

The temp file is there and the field on the form is correct.

In the end, I want it to return a table like this -

Ticker      Quarter      Recommendation      Full Name Category
AOGIX            2012-9-30      1                  Aggressive Allocation
So I can make an update query to change recommendation from 1 to 2.