You can find the official drivers at the AMD Radeon HD 7450M Support Page . Select your OS to see the available options:
(v15.7.1 WHQL, released 2015-07-29) — The final stable non-beta release. Windows 7 / 8.1 (64-bit/32-bit): amd radeon hd 7450m skachat draiver
(v16.2.1, released 2016-03-01) — The most recent, though experimental, version. You can find the official drivers at the
Use the AMD Auto-Detect Tool if you are unsure which version to pick; it will scan your hardware and suggest the correct driver. released 2016-03-01) — The most recent