This is CrashLog. You can read this

Incompatible mods found!
net.fabricmc.loader.impl.FormattedException: net.fabricmc.loader.impl.discovery.ModResolutionException: Mod discovery failed!
at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63)
at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:197)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:146)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: net.fabricmc.loader.impl.discovery.ModResolutionException: Mod discovery failed!
at net.fabricmc.loader.impl.discovery.ModDiscoverer.lambda$discoverMods$1(ModDiscoverer.java:159)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.discovery.ModDiscoverer.discoverMods(ModDiscoverer.java:159)
at net.fabricmc.loader.impl.FabricLoaderImpl.setup(FabricLoaderImpl.java:215)
at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:192)
... 3 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Error analyzing [D:\External Games\Fabric 1.21\mods\modmenu-11.0.0-rc.4.jar]: java.io.FileNotFoundException: D:\External Games\Fabric 1.21\mods\modmenu-11.0.0-rc.4.jar (Operation did not complete successfully because the file contains a virus or potentially unwanted software)
at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)
at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:540)
at java.base/java.util.concurrent.ForkJoinTask.reportExecutionException(ForkJoinTask.java:580)
at java.base/java.util.concurrent.ForkJoinTask.get(ForkJoinTask.java:993)
at net.fabricmc.loader.impl.discovery.ModDiscoverer.discoverMods(ModDiscoverer.java:156)
... 5 more
Caused by: java.lang.RuntimeException: Error analyzing [D:\External Games\Fabric 1.21\mods\modmenu-11.0.0-rc.4.jar]: java.io.FileNotFoundException: D:\External Games\Fabric 1.21\mods\modmenu-11.0.0-rc.4.jar (Operation did not complete successfully because the file contains a virus or potentially unwanted software)
at net.fabricmc.loader.impl.discovery.ModDiscoverer$ModScanTask.compute(ModDiscoverer.java:300)
at net.fabricmc.loader.impl.discovery.ModDiscoverer$ModScanTask.compute(ModDiscoverer.java:249)
at java.base/java.util.concurrent.RecursiveTask.exec(RecursiveTask.java:110)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: java.io.FileNotFoundException: D:\External Games\Fabric 1.21\mods\modmenu-11.0.0-rc.4.jar (Operation did not complete successfully because the file contains a virus or potentially unwanted software)
at java.base/java.io.RandomAccessFile.open0(Native Method)
at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:356)
at java.base/java.io.RandomAccessFile.(RandomAccessFile.java:273)
at java.base/java.io.RandomAccessFile.(RandomAccessFile.java:223)
at java.base/java.util.zip.ZipFile$Source.(ZipFile.java:1492)
at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1458)
at java.base/java.util.zip.ZipFile$CleanableResource.(ZipFile.java:724)
at java.base/java.util.zip.ZipFile.(ZipFile.java:251)
at java.base/java.util.zip.ZipFile.(ZipFile.java:180)
at java.base/java.util.zip.ZipFile.(ZipFile.java:194)
at net.fabricmc.loader.impl.discovery.ModDiscoverer$ModScanTask.computeJarFile(ModDiscoverer.java:321)
at net.fabricmc.loader.impl.discovery.ModDiscoverer$ModScanTask.compute(ModDiscoverer.java:290)
... 7 more

That's a known false positive on jar files, are you able to approve the file somehow in the Actions menu?