Google turns up garbage!!

I'm runnin a network with two Windows XP-based computers connected across through an ethernet switch. Both computers have internet access via winproxy. the host computer works normally, but i'm having a pretty unusual problem with the client.

When I type in some website urls (including google.com) in the address bar, I get the following output in Firefox and Opera; IE tries to download a file.

I ran Norton, AVG, and QuickHeal tests, but no results. Does anybody know why such a thing can happen?

ôÏy€fIºì¾Tìq¬E–|%*iöÓ?#YÎha¡nÙö*=I‘G£ÑüF*cÙ*|7>?ë¾;œôÏOǸœŸµ´š(kZpüáb|z*>jqã§v¢„PóÖF×M¤yn¹’kýÇ)7`0rÍ °)B¬æR(`DJZÆ¥�„4 Q0‹*Xí\ék¿*ûK¹´¨©ù÷íÍÁ¯qA=ãuN—£´]ÿ‹ŠŒJ윆ö5_0)ýö¥\«©fYõ×´—�*m«Y„Z–:s*m��‡®÷§EÛ ÓQÚžh57¨ÛóTqÓŽ¥iÏqB *j’ 5ýG›ù¿Ÿ<#íŠáÕ�YaxTM4µ6ßÂ? >;j+’ƒ´[#»¸5^äØ‚¨l;jYüd;‘*›š¢DͬÒk"

Cheers,
Evil. :)

If your network is connected through a router, it could be using encrypting protection

U might have a download accelerator installed on that system also if its tring to download right away