A 64-bit OS is highly recommended. At the time of writing (July 2014), 4 GB of RAM should be sufficient, and 45 GB of disk space is required to store the blockchain (growing at ~260 MB per day).
The official 32-bit binaries have been reported to work only with PAE enabled. More info here.
If you prefer to just move to a 64-bits Windows, here’s a tutorial.
Assume your 32-bit wallet file name is “wallet.bin” (adjust this instruction for other name accordingly)
Backup your wallet.bin.* files.
Delete ALL Monero files from your computer.
Download 64-bit Monero zip & […]
Why is Monero not user-friendly like most other cryptocurrencies? Why is there no official XMR GUI wallet?
Actually, as the time have passed, the Monero team developed the official GUI wallet:
It looks very nice in comparison to the majority of other cryptocurrencies official wallets.
Official GUI Wallet is available here.
Information about several available GUI wallets can be found on the GUI wallet bounty thread here. Several unofficial GUI wallets are available:
Qt GUI (Cross-platform) by Neozaru
Windows GUI by Jojatekok
lightWallet by jwinterm (avoids running the daemon on your machine, still not as light as SPV, see question above)