W7-32-Ultimate
Bitcoin Core 0.9.0
avast-anti-virus-software found:

roaming-bitcoin-blocks-blk00129.dat: "Diskspoiler"

roaming-bitcoin-chainstate-064498.sst: "Oropax"
roaming-bitcoin-chainstate-064499.sst: "Diskspoiler"
roaming-bitcoin-chainstate-064549.sst: "Yankee Doodle"
roaming-bitcoin-chainstate-064574.sst: "Attention"
roaming-bitcoin-chainstate-064608.sst: "Syslock"
roaming-bitcoin-chainstate-064651.sst: "PrtScr1024"
roaming-bitcoin-chainstate-064681.sst: "Murphy"

cleaned by avast
cleaned the bitcoin-roaming-folder except the wallet-dat
copied clean-two-weeks-old-blockdata to the roaming-folder
avast-scan of the folder - clean
started bitcoin again
some synchronizing-time later
found nearly the same problems:

roaming-bitcoin-blocks-blk00129.dat: "Diskspoiler"

roaming-bitcoin-chainstate-050584.sst: "Diskspoiler"
roaming-bitcoin-chainstate-050592.sst: "Yankee Doodle"
roaming-bitcoin-chainstate-050608.sst: "PrtScr1024"
roaming-bitcoin-chainstate-050617.sst: "Raubkopie"
roaming-bitcoin-chainstate-050619.sst: "Syslock"
roaming-bitcoin-chainstate-050634.sst: "Murphy"
roaming-bitcoin-chainstate-050638.sst: "Oropax"
roaming-bitcoin-chainstate-050696.sst: "Attention"

are these virus(es) in the bitcoin-network?

is it only my problem?

Edit: another W7-64-prof-system is synchronizing with bitcoin 0.8.6-client - lets see if it gets the same problems