According to my wallet 53% of the last 100 blocks were staked with a version of the wallet that is lower than 3.7.14, that isn't too good due to the fact that if you stake a superblock with a wallet version of 3.7.13 or lower there is a chance that the magnitude calculations may be wrong. There have also been a lot of changes and fixes since the last mandatory update 3.7.8 so it would still be a good idea to upgrade even if you aren't on Windows. Also note that the default location of the Gridcoin Wallet was changed not too long ago.
The Windows msi can be found here
SHA256 Checksums for the msi can be found here
Gridcoin is an open source Cryptocurrency (Ticker: GRC) which securely rewards volunteer computing performed upon the Boinc Platform in a decentralized manner on top of proof of stake.
BOINC (Berkeley Open Infrastructure for Network Computing) is a distributed Internet platform and was launched beginning of 2002 and it rewards participants with credits for performed work. BOINC is an application available for multiple Operating Systems and uses the unused CPU and GPU cycles on computers to perform scientific work.