Which wallet client did you use (core, electrum, multibit), and maybe it would be good to also include the version number.
This program uses Qt version 4.8.4.
What program are you talking about?
The stated version of 4.8.4 makes no sence to me, do you mean 0.8.4?
If it's indeed bitcoin QT 0.8.4 :
https://bitcoin.org/en/version-history shows us this version was released on 03/09/2013. It might be advisable for the OP to upgrade, altough i'm not completely sure the upgrade path will be easy to go from such an old version to a new one. It might be a good idear to make a decent backup of the wallet.dat, and try to install bitcoin core on a new pc and import the wallet.dat without touching the old installation (i have no idear if this would work, but at least by not touching the old installation, the risk of ruining his wallet would be small)