huge package loss and checksum errors

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http://serverfault.com – Our 2008 server began to work very slowly within 2 weeks. Our web sites (iis 7.5) are loading very slowly and sometimes its freezing. We began testing with wireshark and saw that our packets are lost during transmission. The client demands the same packets several times, please check below. (CLIENT): 11 3.492500 Client Server TCP 54 61220 > http [ACK] Seq=316 Ack=5521 Win=66240 Len=0 (SERVER) : 12 3.495204 Server Client TCP 1434 [TCP Previous segment lost] [TCP segment of a reassembled PDU] (CLIENT):13 3.495225 Client Server TCP 66 [TCP Dup ACK 11#1] 61220 > http [ACK] Seq=316 Ack=5521 Win (HowTos)