Oracle 10g R2 x64 Windows - Memory allocation

I've installed Oracle 10g R2 x64 on Windows Server 2003 STD X64.
My SGA is configured to use 65% of total memory (3,5Gb).
After few days since instance startup, virtual meory size grow up to 6Gb and OS crash.
Anyone can help me?
Thanks in advance

You might have to work with Oracle support see if you have memory leaking problem.
While your oracle.exe growing VM size, run a statspack report and following query for a quick checking,
select * from v$sgainfo
  1  select se.sid, n.name, max(se.value) maxmem
  2  from v$sesstat se,
  3  v$statname n
  4  where n.statistic#=se.statistic#
  5  and n.name like 'session pga%'
  6  group by n.name, se.sid
  7* order by 3 desc
SQL> /
       SID NAME                                                                 MAXMEM
       216 session pga memory max                                             11836008
       216 session pga memory                                                 11687880
       212 session pga memory max                                              7960728
       225 session pga memory max                                              5880632
       200 session pga memory max                                              5282408
       200 session pga memory                                                  5282408
       217 session pga memory max                                              3995992
       217 session pga memory                                                  3668312
       214 session pga memory max                                              3626952
       212 session pga memory                                                  3176600
....

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