quartus 9.1 use too much hard disk space

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my quartus use too much hard disk space-nearly 37Gbyte.

in the e:\altera\91\quartus\bin64 file folder:

mega_alt2gxb_reconfigq.exe 's size is 2Gbyte.

mega_alt2gxb_reconfig.exe 's size is 2Gbyte.

jtagserver.exe 's size is 2Gbyte.

dmf_ver.exe 's size is 2Gbyte.

cbx_altfpc.exe 's size is 2Gbyte.

in the E:\altera\91\quartus\bin64\jre64\bin file folder:

unpack200.exe

jusched.exe 's size is 2Gbyte.

jucheck.exe 's size is 2Gbyte.

jbroker.exe 's size is 2Gbyte.

javaws.exe 's size is 2Gbyte.

javaw.exe 's size is 2Gbyte.

java.exe 's size is 2Gbyte.

i don't know the rules of these files. are they viruses. can i delete them?

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Hi,

I run my Quartus on 64-bit Vista PC and Quartus needs only 6GByte. Which OS do you use ?

Kind regards

GPK